diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..07fe41c
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,2 @@
+# GitHub syntax highlighting
+pixi.lock linguist-language=YAML linguist-generated=true
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..370b5b2
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2024 Mathieu Daëron
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
diff --git a/code_examples/virtual_data/output.txt b/code_examples/virtual_data/output.txt
index a6d8f6e..a8ac231 100644
--- a/code_examples/virtual_data/output.txt
+++ b/code_examples/virtual_data/output.txt
@@ -23,65 +23,65 @@ FOO     12      -5.00       28.89  0.3024  0.0031  ± 0.0062  0.0070     0.497
 –––  ––––––––––  ––––––  –––––––––––  ––––––––––––  –––––––––  –––––––––  ––––––––––  ––––––––––  ––––––––––  ––––––––––  ––––––––––  –––––––––  –––––––––  –––––––––  ––––––––
 UID     Session  Sample  d13Cwg_VPDB  d18Owg_VSMOW        d45        d46         d47         d48         d49   d13C_VPDB  d18O_VSMOW     D47raw     D48raw     D49raw       D47
 –––  ––––––––––  ––––––  –––––––––––  ––––––––––––  –––––––––  –––––––––  ––––––––––  ––––––––––  ––––––––––  ––––––––––  ––––––––––  –––––––––  –––––––––  –––––––––  ––––––––
-1    Session_01   ETH-1       -4.000        26.000   5.995601  10.755323   16.116087   21.285428   27.780042    1.998631   36.986704  -0.696924  -0.333640   0.008600  0.201787
-2    Session_01     FOO       -4.000        26.000  -0.848028   2.874679    1.346196    5.439150    4.665655   -5.017230   28.951964  -0.601502  -0.316664  -0.081898  0.302042
-3    Session_01     BAR       -4.000        26.000  -9.920507  10.903408    0.065076   21.704075   10.707292  -14.998270   37.174839  -0.307018  -0.216978  -0.026076  0.592818
-4    Session_01   ETH-1       -4.000        26.000   6.010276  10.840276   16.207960   21.475150   27.780042    2.011176   37.073454  -0.704188  -0.315986  -0.172089  0.194589
-5    Session_01     FOO       -4.000        26.000  -0.838118   2.819853    1.310384    5.326005    4.665655   -5.004629   28.895933  -0.593755  -0.319861   0.014956  0.309692
-6    Session_01   ETH-2       -4.000        26.000  -5.974124  -5.955517  -12.668784  -12.208184  -18.023381  -10.163274   19.943159  -0.694902  -0.336672  -0.063946  0.215880
-7    Session_01     FOO       -4.000        26.000  -0.876454   2.906764    1.341194    5.490264    4.665655   -5.048760   28.984806  -0.608593  -0.329808  -0.114437  0.295055
-8    Session_01   ETH-3       -4.000        26.000   5.727341  11.211663   16.713472   22.364770   28.306614    1.695479   37.453503  -0.278056  -0.180158  -0.082015  0.614365
-9    Session_01     BAR       -4.000        26.000  -9.959983  10.926995    0.053806   21.724901   10.707292  -15.041279   37.199026  -0.300066  -0.243252  -0.029371  0.599675
-10   Session_01   ETH-3       -4.000        26.000   5.734896  11.229855   16.740410   22.402091   28.306614    1.702875   37.472070  -0.276998  -0.179635  -0.125368  0.615396
-11   Session_01     BAR       -4.000        26.000  -9.915975  10.968470    0.153453   21.749385   10.707292  -14.995822   37.241294  -0.286638  -0.301325  -0.157376  0.612868
-12   Session_01   ETH-1       -4.000        26.000   6.049381  10.706856   16.135579   21.196941   27.780042    2.057827   36.937067  -0.685751  -0.324384   0.045870  0.212791
-13   Session_01   ETH-2       -4.000        26.000  -5.991278  -5.995054  -12.741562  -12.184075  -18.023381  -10.180122   19.902809  -0.711697  -0.232746   0.032602  0.199357
-14   Session_01   ETH-2       -4.000        26.000  -5.982229  -6.110437  -12.827036  -12.492272  -18.023381  -10.166188   19.784916  -0.693555  -0.312598   0.251040  0.217274
-15   Session_01   ETH-3       -4.000        26.000   5.755174  11.255104   16.792797   22.451660   28.306614    1.723596   37.497816  -0.270825  -0.181089  -0.195908  0.621458
-16   Session_02   ETH-1       -4.000        26.000   5.993918  10.617469   15.991900   21.070358   27.780042    2.006934   36.882679  -0.683329  -0.271476   0.278458  0.216152
-17   Session_02   ETH-1       -4.000        26.000   6.030532  10.851030   16.245571   21.457100   27.780042    2.037466   37.122284  -0.698413  -0.354920  -0.214443  0.200795
-18   Session_02     BAR       -4.000        26.000  -9.963888  10.865863   -0.023549   21.615868   10.707292  -15.053743   37.174715  -0.313906  -0.229031   0.093637  0.597041
-19   Session_02   ETH-3       -4.000        26.000   5.719281  11.207303   16.681693   22.370886   28.306614    1.691780   37.488633  -0.296801  -0.165556  -0.065004  0.606143
-20   Session_02   ETH-1       -4.000        26.000   6.019963  10.773112   16.163825   21.331060   27.780042    2.029040   37.042346  -0.692234  -0.324161  -0.051788  0.207075
+1    Session_01   ETH-3       -4.000        26.000   5.755174  11.255104   16.792797   22.451660   28.306614    1.723596   37.497816  -0.270825  -0.181089  -0.195908  0.621458
+2    Session_01     BAR       -4.000        26.000  -9.959983  10.926995    0.053806   21.724901   10.707292  -15.041279   37.199026  -0.300066  -0.243252  -0.029371  0.599675
+3    Session_01   ETH-3       -4.000        26.000   5.734896  11.229855   16.740410   22.402091   28.306614    1.702875   37.472070  -0.276998  -0.179635  -0.125368  0.615396
+4    Session_01     FOO       -4.000        26.000  -0.838118   2.819853    1.310384    5.326005    4.665655   -5.004629   28.895933  -0.593755  -0.319861   0.014956  0.309692
+5    Session_01     FOO       -4.000        26.000  -0.848028   2.874679    1.346196    5.439150    4.665655   -5.017230   28.951964  -0.601502  -0.316664  -0.081898  0.302042
+6    Session_01   ETH-1       -4.000        26.000   6.010276  10.840276   16.207960   21.475150   27.780042    2.011176   37.073454  -0.704188  -0.315986  -0.172089  0.194589
+7    Session_01     BAR       -4.000        26.000  -9.920507  10.903408    0.065076   21.704075   10.707292  -14.998270   37.174839  -0.307018  -0.216978  -0.026076  0.592818
+8    Session_01   ETH-2       -4.000        26.000  -5.982229  -6.110437  -12.827036  -12.492272  -18.023381  -10.166188   19.784916  -0.693555  -0.312598   0.251040  0.217274
+9    Session_01   ETH-2       -4.000        26.000  -5.991278  -5.995054  -12.741562  -12.184075  -18.023381  -10.180122   19.902809  -0.711697  -0.232746   0.032602  0.199357
+10   Session_01     BAR       -4.000        26.000  -9.915975  10.968470    0.153453   21.749385   10.707292  -14.995822   37.241294  -0.286638  -0.301325  -0.157376  0.612868
+11   Session_01   ETH-3       -4.000        26.000   5.727341  11.211663   16.713472   22.364770   28.306614    1.695479   37.453503  -0.278056  -0.180158  -0.082015  0.614365
+12   Session_01   ETH-2       -4.000        26.000  -5.974124  -5.955517  -12.668784  -12.208184  -18.023381  -10.163274   19.943159  -0.694902  -0.336672  -0.063946  0.215880
+13   Session_01   ETH-1       -4.000        26.000   6.049381  10.706856   16.135579   21.196941   27.780042    2.057827   36.937067  -0.685751  -0.324384   0.045870  0.212791
+14   Session_01     FOO       -4.000        26.000  -0.876454   2.906764    1.341194    5.490264    4.665655   -5.048760   28.984806  -0.608593  -0.329808  -0.114437  0.295055
+15   Session_01   ETH-1       -4.000        26.000   5.995601  10.755323   16.116087   21.285428   27.780042    1.998631   36.986704  -0.696924  -0.333640   0.008600  0.201787
+16   Session_02   ETH-2       -4.000        26.000  -5.982371  -6.036210  -12.762399  -12.309944  -18.023381  -10.175178   19.819614  -0.701348  -0.277354   0.104418  0.212021
+17   Session_02     BAR       -4.000        26.000  -9.963888  10.865863   -0.023549   21.615868   10.707292  -15.053743   37.174715  -0.313906  -0.229031   0.093637  0.597041
+18   Session_02   ETH-3       -4.000        26.000   5.719281  11.207303   16.681693   22.370886   28.306614    1.691780   37.488633  -0.296801  -0.165556  -0.065004  0.606143
+19   Session_02     FOO       -4.000        26.000  -0.848415   2.849823    1.308081    5.427767    4.665655   -5.018107   28.927036  -0.614791  -0.278426  -0.032784  0.292547
+20   Session_02   ETH-1       -4.000        26.000   5.993918  10.617469   15.991900   21.070358   27.780042    2.006934   36.882679  -0.683329  -0.271476   0.278458  0.216152
 21   Session_02     BAR       -4.000        26.000  -9.957566  10.903888    0.031785   21.739434   10.707292  -15.048386   37.213724  -0.302139  -0.183327   0.012926  0.608897
-22   Session_02     FOO       -4.000        26.000  -0.848415   2.849823    1.308081    5.427767    4.665655   -5.018107   28.927036  -0.614791  -0.278426  -0.032784  0.292547
+22   Session_02   ETH-3       -4.000        26.000   5.716356  11.091821   16.582487   22.123857   28.306614    1.692901   37.370126  -0.279100  -0.178789   0.162540  0.624067
 23   Session_02   ETH-2       -4.000        26.000  -5.950370  -5.959974  -12.650784  -12.197864  -18.023381  -10.143809   19.897777  -0.696916  -0.317263  -0.080604  0.216441
-24   Session_02   ETH-2       -4.000        26.000  -5.982371  -6.036210  -12.762399  -12.309944  -18.023381  -10.175178   19.819614  -0.701348  -0.277354   0.104418  0.212021
-25   Session_02     FOO       -4.000        26.000  -0.835046   2.870518    1.355370    5.487896    4.665655   -5.004585   28.948243  -0.601666  -0.259900  -0.087592  0.305777
-26   Session_02   ETH-3       -4.000        26.000   5.716356  11.091821   16.582487   22.123857   28.306614    1.692901   37.370126  -0.279100  -0.178789   0.162540  0.624067
-27   Session_02   ETH-3       -4.000        26.000   5.757137  11.232751   16.744567   22.398244   28.306614    1.731295   37.514660  -0.298533  -0.189123  -0.154557  0.604363
-28   Session_02     BAR       -4.000        26.000  -9.936020  10.862339    0.024660   21.563307   10.707292  -15.023836   37.171034  -0.291333  -0.273498   0.070452  0.619812
-29   Session_02   ETH-2       -4.000        26.000  -5.993476  -5.944866  -12.696865  -12.149754  -18.023381  -10.190430   19.913381  -0.713779  -0.298963  -0.064251  0.199436
-30   Session_02     FOO       -4.000        26.000  -0.819742   2.826793    1.317044    5.330616    4.665655   -4.986618   28.903335  -0.612871  -0.329113  -0.018244  0.294481
+24   Session_02   ETH-3       -4.000        26.000   5.757137  11.232751   16.744567   22.398244   28.306614    1.731295   37.514660  -0.298533  -0.189123  -0.154557  0.604363
+25   Session_02     FOO       -4.000        26.000  -0.819742   2.826793    1.317044    5.330616    4.665655   -4.986618   28.903335  -0.612871  -0.329113  -0.018244  0.294481
+26   Session_02   ETH-1       -4.000        26.000   6.019963  10.773112   16.163825   21.331060   27.780042    2.029040   37.042346  -0.692234  -0.324161  -0.051788  0.207075
+27   Session_02     BAR       -4.000        26.000  -9.936020  10.862339    0.024660   21.563307   10.707292  -15.023836   37.171034  -0.291333  -0.273498   0.070452  0.619812
+28   Session_02   ETH-2       -4.000        26.000  -5.993476  -5.944866  -12.696865  -12.149754  -18.023381  -10.190430   19.913381  -0.713779  -0.298963  -0.064251  0.199436
+29   Session_02     FOO       -4.000        26.000  -0.835046   2.870518    1.355370    5.487896    4.665655   -5.004585   28.948243  -0.601666  -0.259900  -0.087592  0.305777
+30   Session_02   ETH-1       -4.000        26.000   6.030532  10.851030   16.245571   21.457100   27.780042    2.037466   37.122284  -0.698413  -0.354920  -0.214443  0.200795
 31   Session_03     BAR       -4.000        26.000  -9.952115  11.034508    0.169809   21.885915   10.707292  -15.002819   37.370451  -0.296804  -0.298351  -0.246731  0.606414
-32   Session_03   ETH-1       -4.000        26.000   6.004078  10.683951   16.045192   21.214355   27.780042    2.010134   36.971642  -0.705956  -0.262026   0.138399  0.193323
-33   Session_03   ETH-2       -4.000        26.000  -6.000290  -5.947172  -12.697463  -12.164602  -18.023381  -10.167221   19.848953  -0.705037  -0.309350  -0.052386  0.199061
-34   Session_03   ETH-1       -4.000        26.000   6.040566  10.786620   16.205283   21.374963   27.780042    2.045244   37.077432  -0.685706  -0.307909  -0.099869  0.213609
-35   Session_03     FOO       -4.000        26.000  -0.823857   2.761300    1.258060    5.239992    4.665655   -4.973383   28.817444  -0.603327  -0.288652   0.114488  0.298751
-36   Session_03   ETH-3       -4.000        26.000   5.718991  11.146227   16.640814   22.243185   28.306614    1.689442   37.449023  -0.277332  -0.169668   0.053997  0.623187
-37   Session_03   ETH-3       -4.000        26.000   5.748546  11.079879   16.580826   22.120063   28.306614    1.723364   37.380534  -0.302133  -0.158882   0.151641  0.598318
-38   Session_03     FOO       -4.000        26.000  -0.873798   2.820799    1.272165    5.370745    4.665655   -5.028782   28.878917  -0.596008  -0.277258   0.051165  0.306090
-39   Session_03     BAR       -4.000        26.000  -9.928709  10.989665    0.148059   21.852677   10.707292  -14.976237   37.324152  -0.299358  -0.242185  -0.184835  0.603855
-40   Session_03   ETH-2       -4.000        26.000  -5.997147  -5.905858  -12.655382  -12.081612  -18.023381  -10.165400   19.891551  -0.706536  -0.308464  -0.137414  0.197550
-41   Session_03     BAR       -4.000        26.000  -9.957114  10.898997    0.044946   21.602296   10.707292  -15.003175   37.230716  -0.284699  -0.307849   0.021944  0.618578
-42   Session_03   ETH-3       -4.000        26.000   5.753467  11.206589   16.719131   22.373244   28.306614    1.723960   37.511190  -0.294350  -0.161838  -0.099835  0.606103
+32   Session_03     BAR       -4.000        26.000  -9.957114  10.898997    0.044946   21.602296   10.707292  -15.003175   37.230716  -0.284699  -0.307849   0.021944  0.618578
+33   Session_03     FOO       -4.000        26.000  -0.823857   2.761300    1.258060    5.239992    4.665655   -4.973383   28.817444  -0.603327  -0.288652   0.114488  0.298751
+34   Session_03   ETH-3       -4.000        26.000   5.753467  11.206589   16.719131   22.373244   28.306614    1.723960   37.511190  -0.294350  -0.161838  -0.099835  0.606103
+35   Session_03   ETH-1       -4.000        26.000   6.040566  10.786620   16.205283   21.374963   27.780042    2.045244   37.077432  -0.685706  -0.307909  -0.099869  0.213609
+36   Session_03   ETH-1       -4.000        26.000   5.994622  10.743980   16.116098   21.243734   27.780042    1.997857   37.033567  -0.684883  -0.352014   0.031692  0.214449
+37   Session_03     BAR       -4.000        26.000  -9.928709  10.989665    0.148059   21.852677   10.707292  -14.976237   37.324152  -0.299358  -0.242185  -0.184835  0.603855
+38   Session_03   ETH-2       -4.000        26.000  -6.000290  -5.947172  -12.697463  -12.164602  -18.023381  -10.167221   19.848953  -0.705037  -0.309350  -0.052386  0.199061
+39   Session_03   ETH-3       -4.000        26.000   5.748546  11.079879   16.580826   22.120063   28.306614    1.723364   37.380534  -0.302133  -0.158882   0.151641  0.598318
+40   Session_03     FOO       -4.000        26.000  -0.873798   2.820799    1.272165    5.370745    4.665655   -5.028782   28.878917  -0.596008  -0.277258   0.051165  0.306090
+41   Session_03   ETH-3       -4.000        26.000   5.718991  11.146227   16.640814   22.243185   28.306614    1.689442   37.449023  -0.277332  -0.169668   0.053997  0.623187
+42   Session_03   ETH-1       -4.000        26.000   6.004078  10.683951   16.045192   21.214355   27.780042    2.010134   36.971642  -0.705956  -0.262026   0.138399  0.193323
 43   Session_03     FOO       -4.000        26.000  -0.800284   2.851299    1.376828    5.379547    4.665655   -4.951581   28.910199  -0.597293  -0.329315  -0.087015  0.304784
-44   Session_03   ETH-2       -4.000        26.000  -6.008525  -5.909707  -12.647727  -12.075913  -18.023381  -10.177379   19.887608  -0.683183  -0.294956  -0.117608  0.220975
-45   Session_03   ETH-1       -4.000        26.000   5.994622  10.743980   16.116098   21.243734   27.780042    1.997857   37.033567  -0.684883  -0.352014   0.031692  0.214449
-46   Session_04   ETH-3       -4.000        26.000   5.739420  11.128582   16.641344   22.166106   28.306614    1.695046   37.399884  -0.280608  -0.210162   0.066645  0.614665
-47   Session_04   ETH-1       -4.000        26.000   6.029937  10.766997   16.151273   21.345479   27.780042    2.018148   37.027152  -0.708855  -0.297953  -0.050465  0.193862
-48   Session_04   ETH-1       -4.000        26.000   6.023822  10.730714   16.121184   21.235757   27.780042    2.012958   36.989833  -0.696908  -0.333582   0.026555  0.205610
-49   Session_04   ETH-3       -4.000        26.000   5.798016  11.254135   16.832228   22.432473   28.306614    1.752928   37.528936  -0.275047  -0.197935  -0.239408  0.620088
-50   Session_04   ETH-2       -4.000        26.000  -5.973623  -5.975018  -12.694278  -12.194472  -18.023381  -10.166297   19.828211  -0.701951  -0.283570  -0.025935  0.207135
-51   Session_04   ETH-2       -4.000        26.000  -5.966627  -5.893789  -12.597717  -12.120719  -18.023381  -10.161842   19.911776  -0.691757  -0.372308  -0.193986  0.217132
-52   Session_04     FOO       -4.000        26.000  -0.853969   2.805035    1.267571    5.353907    4.665655   -5.030523   28.850660  -0.605611  -0.262571   0.060903  0.298685
-53   Session_04     BAR       -4.000        26.000  -9.926078  10.884823    0.060864   21.650722   10.707292  -15.002880   37.185606  -0.287358  -0.232425   0.016044  0.611760
-54   Session_04   ETH-2       -4.000        26.000  -5.986501  -5.915157  -12.656583  -12.060382  -18.023381  -10.182247   19.889836  -0.709603  -0.268277  -0.130450  0.199604
-55   Session_04     BAR       -4.000        26.000  -9.951025  10.951923    0.089386   21.738926   10.707292  -15.031949   37.254709  -0.298065  -0.278834  -0.087463  0.601230
-56   Session_04   ETH-3       -4.000        26.000   5.751908  11.207110   16.726741   22.380392   28.306614    1.705481   37.480657  -0.285776  -0.155878  -0.099197  0.609567
-57   Session_04   ETH-1       -4.000        26.000   6.017312  10.735930   16.123043   21.270597   27.780042    2.005824   36.995214  -0.693479  -0.309795   0.023309  0.208980
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+53   Session_04   ETH-3       -4.000        26.000   5.798016  11.254135   16.832228   22.432473   28.306614    1.752928   37.528936  -0.275047  -0.197935  -0.239408  0.620088
+54   Session_04     FOO       -4.000        26.000  -0.791191   2.708220    1.256167    5.145784    4.665655   -4.960004   28.750896  -0.586913  -0.276505   0.183674  0.317065
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+56   Session_04   ETH-1       -4.000        26.000   6.017312  10.735930   16.123043   21.270597   27.780042    2.005824   36.995214  -0.693479  -0.309795   0.023309  0.208980
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     <style>/*! custom.css */</style></head>
 <body>
     <nav class="pdoc">
@@ -41,9 +41,15 @@ <h2>Contents</h2>
 
             <h2>API Documentation</h2>
                 <ul class="memberlist">
+            <li>
+                    <a class="variable" href="#Petersen_etal_CO2eqD47">Petersen_etal_CO2eqD47</a>
+            </li>
             <li>
                     <a class="function" href="#fCO2eqD47_Petersen">fCO2eqD47_Petersen</a>
             </li>
+            <li>
+                    <a class="variable" href="#Wang_etal_CO2eqD47">Wang_etal_CO2eqD47</a>
+            </li>
             <li>
                     <a class="function" href="#fCO2eqD47_Wang">fCO2eqD47_Wang</a>
             </li>
@@ -128,6 +134,21 @@ <h2>API Documentation</h2>
                         <li>
                                 <a class="variable" href="#D4xdata.d18O_STANDARDIZATION_METHOD">d18O_STANDARDIZATION_METHOD</a>
                         </li>
+                        <li>
+                                <a class="variable" href="#D4xdata.verbose">verbose</a>
+                        </li>
+                        <li>
+                                <a class="variable" href="#D4xdata.prefix">prefix</a>
+                        </li>
+                        <li>
+                                <a class="variable" href="#D4xdata.logfile">logfile</a>
+                        </li>
+                        <li>
+                                <a class="variable" href="#D4xdata.Nf">Nf</a>
+                        </li>
+                        <li>
+                                <a class="variable" href="#D4xdata.repeatability">repeatability</a>
+                        </li>
                         <li>
                                 <a class="function" href="#D4xdata.make_verbal">make_verbal</a>
                         </li>
@@ -272,6 +293,9 @@ <h2>API Documentation</h2>
                         <li>
                                 <a class="variable" href="#D47data.Nominal_D4x">Nominal_D4x</a>
                         </li>
+                        <li>
+                                <a class="variable" href="#D47data.Nominal_D47">Nominal_D47</a>
+                        </li>
                         <li>
                                 <a class="function" href="#D47data.D47fromTeq">D47fromTeq</a>
                         </li>
@@ -290,6 +314,9 @@ <h2>API Documentation</h2>
                         <li>
                                 <a class="variable" href="#D48data.Nominal_D4x">Nominal_D4x</a>
                         </li>
+                        <li>
+                                <a class="variable" href="#D48data.Nominal_D48">Nominal_D48</a>
+                        </li>
                         <li>
                                 <a class="function" href="#D48data.save_D48_correl">save_D48_correl</a>
                         </li>
@@ -305,6 +332,9 @@ <h2>API Documentation</h2>
                         <li>
                                 <a class="variable" href="#D49data.Nominal_D4x">Nominal_D4x</a>
                         </li>
+                        <li>
+                                <a class="variable" href="#D49data.Nominal_D49">Nominal_D49</a>
+                        </li>
                         <li>
                                 <a class="function" href="#D49data.save_D49_correl">save_D49_correl</a>
                         </li>
@@ -388,7 +418,7 @@ <h2 id="12-usage">1.2 Usage</h2>
 
 <div class="pdoc-code codehilite">
 <pre><span></span><code><span class="kn">import</span> <span class="nn">D47crunch</span>
-<span class="n">mydata</span> <span class="o">=</span> <span class="n"><a href="#D47data">D47crunch.D47data</a></span><span class="p">()</span>
+<span class="n">mydata</span> <span class="o">=</span> <span class="n"><a href="#D47data">D47data</a></span><span class="p">()</span>
 </code></pre>
 </div>
 
@@ -621,8 +651,8 @@ <h2 id="23-use-a-different-set-of-anchors-change-anchor-nominal-values-andor-cha
 <ul>
 <li><code><a href="#D4xdata.Nominal_d13C_VPDB">D4xdata.Nominal_d13C_VPDB</a></code></li>
 <li><code><a href="#D4xdata.Nominal_d18O_VPDB">D4xdata.Nominal_d18O_VPDB</a></code></li>
-<li><code><a href="#D47data.Nominal_D4x">D47data.Nominal_D4x</a></code> (also accessible through <code>D47data.Nominal_D47</code>)</li>
-<li><code><a href="#D48data.Nominal_D4x">D48data.Nominal_D4x</a></code> (also accessible through <code>D48data.Nominal_D48</code>)</li>
+<li><code><a href="#D47data.Nominal_D4x">D47data.Nominal_D4x</a></code> (also accessible through <code><a href="#D47data.Nominal_D47">D47data.Nominal_D47</a></code>)</li>
+<li><code><a href="#D48data.Nominal_D4x">D48data.Nominal_D4x</a></code> (also accessible through <code><a href="#D48data.Nominal_D48">D48data.Nominal_D48</a></code>)</li>
 </ul>
 
 <p><sup>17</sup>O correction parameters are defined by:</p>
@@ -638,7 +668,7 @@ <h2 id="23-use-a-different-set-of-anchors-change-anchor-nominal-values-andor-cha
 
 <p>When creating a new instance of <code><a href="#D47data">D47data</a></code> or <code><a href="#D48data">D48data</a></code>, the current values of these variables are copied as properties of the new object. Applying custom values for, e.g., <code>R17_VSMOW</code> and <code>Nominal_D47</code> can thus be done in several ways:</p>
 
-<p><strong>Option 1:</strong> by redefining <code><a href="#D4xdata.R17_VSMOW">D4xdata.R17_VSMOW</a></code> and <code>D47data.Nominal_D47</code> _before_ creating a <code><a href="#D47data">D47data</a></code> object:</p>
+<p><strong>Option 1:</strong> by redefining <code><a href="#D4xdata.R17_VSMOW">D4xdata.R17_VSMOW</a></code> and <code><a href="#D47data.Nominal_D47">D47data.Nominal_D47</a></code> _before_ creating a <code><a href="#D47data">D47data</a></code> object:</p>
 
 <div class="pdoc-code codehilite">
 <pre><span></span><code><span class="kn">from</span> <span class="nn">D47crunch</span> <span class="kn">import</span> <span class="n">D4xdata</span><span class="p">,</span> <span class="n">D47data</span>
@@ -914,9 +944,9 @@ <h1 id="4-api-documentation">4. API Documentation</h1>
 </span><span id="L-9"><a href="#L-9"><span class="linenos">   9</span></a><span class="sd">The **tutorial** section takes you through a series of simple steps to import/process data and print out the results.</span>
 </span><span id="L-10"><a href="#L-10"><span class="linenos">  10</span></a><span class="sd">The **how-to** section provides instructions applicable to various specific tasks.</span>
 </span><span id="L-11"><a href="#L-11"><span class="linenos">  11</span></a>
-</span><span id="L-12"><a href="#L-12"><span class="linenos">  12</span></a><span class="sd">.. include:: ../docs/tutorial.md</span>
-</span><span id="L-13"><a href="#L-13"><span class="linenos">  13</span></a><span class="sd">.. include:: ../docs/howto.md</span>
-</span><span id="L-14"><a href="#L-14"><span class="linenos">  14</span></a><span class="sd">.. include:: ../docs/cli.md</span>
+</span><span id="L-12"><a href="#L-12"><span class="linenos">  12</span></a><span class="sd">.. include:: ../../docpages/tutorial.md</span>
+</span><span id="L-13"><a href="#L-13"><span class="linenos">  13</span></a><span class="sd">.. include:: ../../docpages/howto.md</span>
+</span><span id="L-14"><a href="#L-14"><span class="linenos">  14</span></a><span class="sd">.. include:: ../../docpages/cli.md</span>
 </span><span id="L-15"><a href="#L-15"><span class="linenos">  15</span></a>
 </span><span id="L-16"><a href="#L-16"><span class="linenos">  16</span></a><span class="sd"># 4. API Documentation</span>
 </span><span id="L-17"><a href="#L-17"><span class="linenos">  17</span></a><span class="sd">&#39;&#39;&#39;</span>
@@ -1377,13 +1407,13 @@ <h1 id="4-api-documentation">4. API Documentation</h1>
 </span><span id="L-472"><a href="#L-472"><span class="linenos"> 472</span></a><span class="sd">	anchors and unknowns for a bunch of sessions:</span>
 </span><span id="L-473"><a href="#L-473"><span class="linenos"> 473</span></a>
 </span><span id="L-474"><a href="#L-474"><span class="linenos"> 474</span></a><span class="sd">	```py</span>
-</span><span id="L-475"><a href="#L-475"><span class="linenos"> 475</span></a><span class="sd">	.. include:: ../code_examples/virtual_data/example.py</span>
+</span><span id="L-475"><a href="#L-475"><span class="linenos"> 475</span></a><span class="sd">	.. include:: ../../code_examples/virtual_data/example.py</span>
 </span><span id="L-476"><a href="#L-476"><span class="linenos"> 476</span></a><span class="sd">	```</span>
 </span><span id="L-477"><a href="#L-477"><span class="linenos"> 477</span></a><span class="sd">	</span>
 </span><span id="L-478"><a href="#L-478"><span class="linenos"> 478</span></a><span class="sd">	This should output something like:</span>
 </span><span id="L-479"><a href="#L-479"><span class="linenos"> 479</span></a><span class="sd">	</span>
 </span><span id="L-480"><a href="#L-480"><span class="linenos"> 480</span></a><span class="sd">	```</span>
-</span><span id="L-481"><a href="#L-481"><span class="linenos"> 481</span></a><span class="sd">	.. include:: ../code_examples/virtual_data/output.txt</span>
+</span><span id="L-481"><a href="#L-481"><span class="linenos"> 481</span></a><span class="sd">	.. include:: ../../code_examples/virtual_data/output.txt</span>
 </span><span id="L-482"><a href="#L-482"><span class="linenos"> 482</span></a><span class="sd">	```</span>
 </span><span id="L-483"><a href="#L-483"><span class="linenos"> 483</span></a><span class="sd">	&#39;&#39;&#39;</span>
 </span><span id="L-484"><a href="#L-484"><span class="linenos"> 484</span></a>	
@@ -4417,6 +4447,406 @@ <h1 id="4-api-documentation">4. API Documentation</h1>
 
 
             </section>
+                <section id="Petersen_etal_CO2eqD47">
+                    <div class="attr variable">
+            <span class="name">Petersen_etal_CO2eqD47</span>        =
+<input id="Petersen_etal_CO2eqD47-view-value" class="view-value-toggle-state" type="checkbox" aria-hidden="true" tabindex="-1">
+            <label class="view-value-button pdoc-button" for="Petersen_etal_CO2eqD47-view-value"></label><span class="default_value">array([[-1.20000000e+01,  1.14711357e+00],
+       [-1.10000000e+01,  1.13996122e+00],
+       [-1.00000000e+01,  1.13287286e+00],
+       [-9.00000000e+00,  1.12584768e+00],
+       [-8.00000000e+00,  1.11888489e+00],
+       [-7.00000000e+00,  1.11198371e+00],
+       [-6.00000000e+00,  1.10514337e+00],
+       [-5.00000000e+00,  1.09836311e+00],
+       [-4.00000000e+00,  1.09164218e+00],
+       [-3.00000000e+00,  1.08497986e+00],
+       [-2.00000000e+00,  1.07837542e+00],
+       [-1.00000000e+00,  1.07182816e+00],
+       [ 0.00000000e+00,  1.06533736e+00],
+       [ 1.00000000e+00,  1.05890235e+00],
+       [ 2.00000000e+00,  1.05252244e+00],
+       [ 3.00000000e+00,  1.04619698e+00],
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+       [ 9.95000000e+02,  2.69061120e-02],
+       [ 1.00000000e+03,  2.65834450e-02],
+       [ 1.00500000e+03,  2.62659080e-02],
+       [ 1.01000000e+03,  2.59534050e-02],
+       [ 1.01500000e+03,  2.56458410e-02],
+       [ 1.02000000e+03,  2.53431240e-02],
+       [ 1.02500000e+03,  2.50451630e-02],
+       [ 1.03000000e+03,  2.47518710e-02],
+       [ 1.03500000e+03,  2.44631600e-02],
+       [ 1.04000000e+03,  2.41789470e-02],
+       [ 1.04500000e+03,  2.38991470e-02],
+       [ 1.05000000e+03,  2.36236800e-02],
+       [ 1.05500000e+03,  2.33524670e-02],
+       [ 1.06000000e+03,  2.30854290e-02],
+       [ 1.06500000e+03,  2.28224910e-02],
+       [ 1.07000000e+03,  2.25635770e-02],
+       [ 1.07500000e+03,  2.23086150e-02],
+       [ 1.08000000e+03,  2.20575330e-02],
+       [ 1.08500000e+03,  2.18102600e-02],
+       [ 1.09000000e+03,  2.15667290e-02],
+       [ 1.09500000e+03,  2.13268720e-02],
+       [ 1.10000000e+03,  2.10906220e-02]])</span>
+
+        
+    </div>
+    <a class="headerlink" href="#Petersen_etal_CO2eqD47"></a>
+    
+    
+
+                </section>
                 <section id="fCO2eqD47_Petersen">
                             <input id="fCO2eqD47_Petersen-view-source" class="view-source-toggle-state" type="checkbox" aria-hidden="true" tabindex="-1">
 <div class="attr function">
@@ -4443,6 +4873,136 @@ <h1 id="4-api-documentation">4. API Documentation</h1>
 </div>
 
 
+                </section>
+                <section id="Wang_etal_CO2eqD47">
+                    <div class="attr variable">
+            <span class="name">Wang_etal_CO2eqD47</span>        =
+<input id="Wang_etal_CO2eqD47-view-value" class="view-value-toggle-state" type="checkbox" aria-hidden="true" tabindex="-1">
+            <label class="view-value-button pdoc-button" for="Wang_etal_CO2eqD47-view-value"></label><span class="default_value">array([[-8.3000e+01,  1.8954e+00],
+       [-7.3000e+01,  1.7530e+00],
+       [-6.3000e+01,  1.6261e+00],
+       [-5.3000e+01,  1.5126e+00],
+       [-4.3000e+01,  1.4104e+00],
+       [-3.3000e+01,  1.3182e+00],
+       [-2.3000e+01,  1.2345e+00],
+       [-1.3000e+01,  1.1584e+00],
+       [-3.0000e+00,  1.0888e+00],
+       [ 7.0000e+00,  1.0251e+00],
+       [ 1.7000e+01,  9.6650e-01],
+       [ 2.7000e+01,  9.1250e-01],
+       [ 3.7000e+01,  8.6260e-01],
+       [ 4.7000e+01,  8.1640e-01],
+       [ 5.7000e+01,  7.7340e-01],
+       [ 6.7000e+01,  7.3340e-01],
+       [ 8.7000e+01,  6.6120e-01],
+       [ 9.7000e+01,  6.2860e-01],
+       [ 1.0700e+02,  5.9800e-01],
+       [ 1.1700e+02,  5.6930e-01],
+       [ 1.2700e+02,  5.4230e-01],
+       [ 1.3700e+02,  5.1690e-01],
+       [ 1.4700e+02,  4.9300e-01],
+       [ 1.5700e+02,  4.7040e-01],
+       [ 1.6700e+02,  4.4910e-01],
+       [ 1.7700e+02,  4.2890e-01],
+       [ 1.8700e+02,  4.0980e-01],
+       [ 1.9700e+02,  3.9180e-01],
+       [ 2.0700e+02,  3.7470e-01],
+       [ 2.1700e+02,  3.5850e-01],
+       [ 2.2700e+02,  3.4310e-01],
+       [ 2.3700e+02,  3.2850e-01],
+       [ 2.4700e+02,  3.1470e-01],
+       [ 2.5700e+02,  3.0150e-01],
+       [ 2.6700e+02,  2.8900e-01],
+       [ 2.7700e+02,  2.7710e-01],
+       [ 2.8700e+02,  2.6570e-01],
+       [ 2.9700e+02,  2.5500e-01],
+       [ 3.0700e+02,  2.4470e-01],
+       [ 3.1700e+02,  2.3490e-01],
+       [ 3.2700e+02,  2.2560e-01],
+       [ 3.3700e+02,  2.1670e-01],
+       [ 3.4700e+02,  2.0830e-01],
+       [ 3.5700e+02,  2.0020e-01],
+       [ 3.6700e+02,  1.9250e-01],
+       [ 3.7700e+02,  1.8510e-01],
+       [ 3.8700e+02,  1.7810e-01],
+       [ 3.9700e+02,  1.7140e-01],
+       [ 4.0700e+02,  1.6500e-01],
+       [ 4.1700e+02,  1.5890e-01],
+       [ 4.2700e+02,  1.5300e-01],
+       [ 4.3700e+02,  1.4740e-01],
+       [ 4.4700e+02,  1.4210e-01],
+       [ 4.5700e+02,  1.3700e-01],
+       [ 4.6700e+02,  1.3210e-01],
+       [ 4.7700e+02,  1.2740e-01],
+       [ 4.8700e+02,  1.2290e-01],
+       [ 4.9700e+02,  1.1860e-01],
+       [ 5.0700e+02,  1.1450e-01],
+       [ 5.1700e+02,  1.1050e-01],
+       [ 5.2700e+02,  1.0680e-01],
+       [ 5.3700e+02,  1.0310e-01],
+       [ 5.4700e+02,  9.9700e-02],
+       [ 5.5700e+02,  9.6300e-02],
+       [ 5.6700e+02,  9.3100e-02],
+       [ 5.7700e+02,  9.0100e-02],
+       [ 5.8700e+02,  8.7100e-02],
+       [ 5.9700e+02,  8.4300e-02],
+       [ 6.0700e+02,  8.1600e-02],
+       [ 6.1700e+02,  7.9000e-02],
+       [ 6.2700e+02,  7.6500e-02],
+       [ 6.3700e+02,  7.4100e-02],
+       [ 6.4700e+02,  7.1800e-02],
+       [ 6.5700e+02,  6.9500e-02],
+       [ 6.6700e+02,  6.7400e-02],
+       [ 6.7700e+02,  6.5400e-02],
+       [ 6.8700e+02,  6.3400e-02],
+       [ 6.9700e+02,  6.1500e-02],
+       [ 7.0700e+02,  5.9700e-02],
+       [ 7.1700e+02,  5.7900e-02],
+       [ 7.2700e+02,  5.6200e-02],
+       [ 7.3700e+02,  5.4600e-02],
+       [ 7.4700e+02,  5.3000e-02],
+       [ 7.5700e+02,  5.1500e-02],
+       [ 7.6700e+02,  5.0000e-02],
+       [ 7.7700e+02,  4.8600e-02],
+       [ 7.8700e+02,  4.7200e-02],
+       [ 7.9700e+02,  4.5900e-02],
+       [ 8.0700e+02,  4.4700e-02],
+       [ 8.1700e+02,  4.3500e-02],
+       [ 8.2700e+02,  4.2300e-02],
+       [ 8.3700e+02,  4.1100e-02],
+       [ 8.4700e+02,  4.0000e-02],
+       [ 8.5700e+02,  3.9000e-02],
+       [ 8.6700e+02,  3.8000e-02],
+       [ 8.7700e+02,  3.7000e-02],
+       [ 8.8700e+02,  3.6000e-02],
+       [ 8.9700e+02,  3.5100e-02],
+       [ 9.0700e+02,  3.4200e-02],
+       [ 9.1700e+02,  3.3300e-02],
+       [ 9.2700e+02,  3.2500e-02],
+       [ 9.3700e+02,  3.1700e-02],
+       [ 9.4700e+02,  3.0900e-02],
+       [ 9.5700e+02,  3.0200e-02],
+       [ 9.6700e+02,  2.9400e-02],
+       [ 9.7700e+02,  2.8700e-02],
+       [ 9.8700e+02,  2.8100e-02],
+       [ 9.9700e+02,  2.7400e-02],
+       [ 1.0070e+03,  2.6800e-02],
+       [ 1.0170e+03,  2.6100e-02],
+       [ 1.0270e+03,  2.5500e-02],
+       [ 1.0370e+03,  2.4900e-02],
+       [ 1.0470e+03,  2.4400e-02],
+       [ 1.0570e+03,  2.3800e-02],
+       [ 1.0670e+03,  2.3300e-02],
+       [ 1.0770e+03,  2.2800e-02],
+       [ 1.0870e+03,  2.2300e-02],
+       [ 1.0970e+03,  2.1800e-02]])</span>
+
+        
+    </div>
+    <a class="headerlink" href="#Wang_etal_CO2eqD47"></a>
+    
+    
+
                 </section>
                 <section id="fCO2eqD47_Wang">
                             <input id="fCO2eqD47_Wang-view-source" class="view-source-toggle-state" type="checkbox" aria-hidden="true" tabindex="-1">
@@ -5157,13 +5717,13 @@ <h1 id="4-api-documentation">4. API Documentation</h1>
 </span><span id="virtual_data-473"><a href="#virtual_data-473"><span class="linenos">473</span></a><span class="sd">	anchors and unknowns for a bunch of sessions:</span>
 </span><span id="virtual_data-474"><a href="#virtual_data-474"><span class="linenos">474</span></a>
 </span><span id="virtual_data-475"><a href="#virtual_data-475"><span class="linenos">475</span></a><span class="sd">	```py</span>
-</span><span id="virtual_data-476"><a href="#virtual_data-476"><span class="linenos">476</span></a><span class="sd">	.. include:: ../code_examples/virtual_data/example.py</span>
+</span><span id="virtual_data-476"><a href="#virtual_data-476"><span class="linenos">476</span></a><span class="sd">	.. include:: ../../code_examples/virtual_data/example.py</span>
 </span><span id="virtual_data-477"><a href="#virtual_data-477"><span class="linenos">477</span></a><span class="sd">	```</span>
 </span><span id="virtual_data-478"><a href="#virtual_data-478"><span class="linenos">478</span></a><span class="sd">	</span>
 </span><span id="virtual_data-479"><a href="#virtual_data-479"><span class="linenos">479</span></a><span class="sd">	This should output something like:</span>
 </span><span id="virtual_data-480"><a href="#virtual_data-480"><span class="linenos">480</span></a><span class="sd">	</span>
 </span><span id="virtual_data-481"><a href="#virtual_data-481"><span class="linenos">481</span></a><span class="sd">	```</span>
-</span><span id="virtual_data-482"><a href="#virtual_data-482"><span class="linenos">482</span></a><span class="sd">	.. include:: ../code_examples/virtual_data/output.txt</span>
+</span><span id="virtual_data-482"><a href="#virtual_data-482"><span class="linenos">482</span></a><span class="sd">	.. include:: ../../code_examples/virtual_data/output.txt</span>
 </span><span id="virtual_data-483"><a href="#virtual_data-483"><span class="linenos">483</span></a><span class="sd">	```</span>
 </span><span id="virtual_data-484"><a href="#virtual_data-484"><span class="linenos">484</span></a><span class="sd">	&#39;&#39;&#39;</span>
 </span><span id="virtual_data-485"><a href="#virtual_data-485"><span class="linenos">485</span></a>	
@@ -5326,66 +5886,66 @@ <h1 id="4-api-documentation">4. API Documentation</h1>
 –––  ––––––––––  ––––––  –––––––––––  ––––––––––––  –––––––––  –––––––––  ––––––––––  ––––––––––  ––––––––––  ––––––––––  ––––––––––  –––––––––  –––––––––  –––––––––  ––––––––
 UID     Session  Sample  d13Cwg_VPDB  d18Owg_VSMOW        d45        d46         d47         d48         d49   d13C_VPDB  d18O_VSMOW     D47raw     D48raw     D49raw       D47
 –––  ––––––––––  ––––––  –––––––––––  ––––––––––––  –––––––––  –––––––––  ––––––––––  ––––––––––  ––––––––––  ––––––––––  ––––––––––  –––––––––  –––––––––  –––––––––  ––––––––
-1    Session_01   ETH-1       -4.000        26.000   5.995601  10.755323   16.116087   21.285428   27.780042    1.998631   36.986704  -0.696924  -0.333640   0.008600  0.201787
-2    Session_01     FOO       -4.000        26.000  -0.848028   2.874679    1.346196    5.439150    4.665655   -5.017230   28.951964  -0.601502  -0.316664  -0.081898  0.302042
-3    Session_01     BAR       -4.000        26.000  -9.920507  10.903408    0.065076   21.704075   10.707292  -14.998270   37.174839  -0.307018  -0.216978  -0.026076  0.592818
-4    Session_01   ETH-1       -4.000        26.000   6.010276  10.840276   16.207960   21.475150   27.780042    2.011176   37.073454  -0.704188  -0.315986  -0.172089  0.194589
-5    Session_01     FOO       -4.000        26.000  -0.838118   2.819853    1.310384    5.326005    4.665655   -5.004629   28.895933  -0.593755  -0.319861   0.014956  0.309692
-6    Session_01   ETH-2       -4.000        26.000  -5.974124  -5.955517  -12.668784  -12.208184  -18.023381  -10.163274   19.943159  -0.694902  -0.336672  -0.063946  0.215880
-7    Session_01     FOO       -4.000        26.000  -0.876454   2.906764    1.341194    5.490264    4.665655   -5.048760   28.984806  -0.608593  -0.329808  -0.114437  0.295055
-8    Session_01   ETH-3       -4.000        26.000   5.727341  11.211663   16.713472   22.364770   28.306614    1.695479   37.453503  -0.278056  -0.180158  -0.082015  0.614365
-9    Session_01     BAR       -4.000        26.000  -9.959983  10.926995    0.053806   21.724901   10.707292  -15.041279   37.199026  -0.300066  -0.243252  -0.029371  0.599675
-10   Session_01   ETH-3       -4.000        26.000   5.734896  11.229855   16.740410   22.402091   28.306614    1.702875   37.472070  -0.276998  -0.179635  -0.125368  0.615396
-11   Session_01     BAR       -4.000        26.000  -9.915975  10.968470    0.153453   21.749385   10.707292  -14.995822   37.241294  -0.286638  -0.301325  -0.157376  0.612868
-12   Session_01   ETH-1       -4.000        26.000   6.049381  10.706856   16.135579   21.196941   27.780042    2.057827   36.937067  -0.685751  -0.324384   0.045870  0.212791
-13   Session_01   ETH-2       -4.000        26.000  -5.991278  -5.995054  -12.741562  -12.184075  -18.023381  -10.180122   19.902809  -0.711697  -0.232746   0.032602  0.199357
-14   Session_01   ETH-2       -4.000        26.000  -5.982229  -6.110437  -12.827036  -12.492272  -18.023381  -10.166188   19.784916  -0.693555  -0.312598   0.251040  0.217274
-15   Session_01   ETH-3       -4.000        26.000   5.755174  11.255104   16.792797   22.451660   28.306614    1.723596   37.497816  -0.270825  -0.181089  -0.195908  0.621458
-16   Session_02   ETH-1       -4.000        26.000   5.993918  10.617469   15.991900   21.070358   27.780042    2.006934   36.882679  -0.683329  -0.271476   0.278458  0.216152
-17   Session_02   ETH-1       -4.000        26.000   6.030532  10.851030   16.245571   21.457100   27.780042    2.037466   37.122284  -0.698413  -0.354920  -0.214443  0.200795
-18   Session_02     BAR       -4.000        26.000  -9.963888  10.865863   -0.023549   21.615868   10.707292  -15.053743   37.174715  -0.313906  -0.229031   0.093637  0.597041
-19   Session_02   ETH-3       -4.000        26.000   5.719281  11.207303   16.681693   22.370886   28.306614    1.691780   37.488633  -0.296801  -0.165556  -0.065004  0.606143
-20   Session_02   ETH-1       -4.000        26.000   6.019963  10.773112   16.163825   21.331060   27.780042    2.029040   37.042346  -0.692234  -0.324161  -0.051788  0.207075
+1    Session_01   ETH-3       -4.000        26.000   5.755174  11.255104   16.792797   22.451660   28.306614    1.723596   37.497816  -0.270825  -0.181089  -0.195908  0.621458
+2    Session_01     BAR       -4.000        26.000  -9.959983  10.926995    0.053806   21.724901   10.707292  -15.041279   37.199026  -0.300066  -0.243252  -0.029371  0.599675
+3    Session_01   ETH-3       -4.000        26.000   5.734896  11.229855   16.740410   22.402091   28.306614    1.702875   37.472070  -0.276998  -0.179635  -0.125368  0.615396
+4    Session_01     FOO       -4.000        26.000  -0.838118   2.819853    1.310384    5.326005    4.665655   -5.004629   28.895933  -0.593755  -0.319861   0.014956  0.309692
+5    Session_01     FOO       -4.000        26.000  -0.848028   2.874679    1.346196    5.439150    4.665655   -5.017230   28.951964  -0.601502  -0.316664  -0.081898  0.302042
+6    Session_01   ETH-1       -4.000        26.000   6.010276  10.840276   16.207960   21.475150   27.780042    2.011176   37.073454  -0.704188  -0.315986  -0.172089  0.194589
+7    Session_01     BAR       -4.000        26.000  -9.920507  10.903408    0.065076   21.704075   10.707292  -14.998270   37.174839  -0.307018  -0.216978  -0.026076  0.592818
+8    Session_01   ETH-2       -4.000        26.000  -5.982229  -6.110437  -12.827036  -12.492272  -18.023381  -10.166188   19.784916  -0.693555  -0.312598   0.251040  0.217274
+9    Session_01   ETH-2       -4.000        26.000  -5.991278  -5.995054  -12.741562  -12.184075  -18.023381  -10.180122   19.902809  -0.711697  -0.232746   0.032602  0.199357
+10   Session_01     BAR       -4.000        26.000  -9.915975  10.968470    0.153453   21.749385   10.707292  -14.995822   37.241294  -0.286638  -0.301325  -0.157376  0.612868
+11   Session_01   ETH-3       -4.000        26.000   5.727341  11.211663   16.713472   22.364770   28.306614    1.695479   37.453503  -0.278056  -0.180158  -0.082015  0.614365
+12   Session_01   ETH-2       -4.000        26.000  -5.974124  -5.955517  -12.668784  -12.208184  -18.023381  -10.163274   19.943159  -0.694902  -0.336672  -0.063946  0.215880
+13   Session_01   ETH-1       -4.000        26.000   6.049381  10.706856   16.135579   21.196941   27.780042    2.057827   36.937067  -0.685751  -0.324384   0.045870  0.212791
+14   Session_01     FOO       -4.000        26.000  -0.876454   2.906764    1.341194    5.490264    4.665655   -5.048760   28.984806  -0.608593  -0.329808  -0.114437  0.295055
+15   Session_01   ETH-1       -4.000        26.000   5.995601  10.755323   16.116087   21.285428   27.780042    1.998631   36.986704  -0.696924  -0.333640   0.008600  0.201787
+16   Session_02   ETH-2       -4.000        26.000  -5.982371  -6.036210  -12.762399  -12.309944  -18.023381  -10.175178   19.819614  -0.701348  -0.277354   0.104418  0.212021
+17   Session_02     BAR       -4.000        26.000  -9.963888  10.865863   -0.023549   21.615868   10.707292  -15.053743   37.174715  -0.313906  -0.229031   0.093637  0.597041
+18   Session_02   ETH-3       -4.000        26.000   5.719281  11.207303   16.681693   22.370886   28.306614    1.691780   37.488633  -0.296801  -0.165556  -0.065004  0.606143
+19   Session_02     FOO       -4.000        26.000  -0.848415   2.849823    1.308081    5.427767    4.665655   -5.018107   28.927036  -0.614791  -0.278426  -0.032784  0.292547
+20   Session_02   ETH-1       -4.000        26.000   5.993918  10.617469   15.991900   21.070358   27.780042    2.006934   36.882679  -0.683329  -0.271476   0.278458  0.216152
 21   Session_02     BAR       -4.000        26.000  -9.957566  10.903888    0.031785   21.739434   10.707292  -15.048386   37.213724  -0.302139  -0.183327   0.012926  0.608897
-22   Session_02     FOO       -4.000        26.000  -0.848415   2.849823    1.308081    5.427767    4.665655   -5.018107   28.927036  -0.614791  -0.278426  -0.032784  0.292547
+22   Session_02   ETH-3       -4.000        26.000   5.716356  11.091821   16.582487   22.123857   28.306614    1.692901   37.370126  -0.279100  -0.178789   0.162540  0.624067
 23   Session_02   ETH-2       -4.000        26.000  -5.950370  -5.959974  -12.650784  -12.197864  -18.023381  -10.143809   19.897777  -0.696916  -0.317263  -0.080604  0.216441
-24   Session_02   ETH-2       -4.000        26.000  -5.982371  -6.036210  -12.762399  -12.309944  -18.023381  -10.175178   19.819614  -0.701348  -0.277354   0.104418  0.212021
-25   Session_02     FOO       -4.000        26.000  -0.835046   2.870518    1.355370    5.487896    4.665655   -5.004585   28.948243  -0.601666  -0.259900  -0.087592  0.305777
-26   Session_02   ETH-3       -4.000        26.000   5.716356  11.091821   16.582487   22.123857   28.306614    1.692901   37.370126  -0.279100  -0.178789   0.162540  0.624067
-27   Session_02   ETH-3       -4.000        26.000   5.757137  11.232751   16.744567   22.398244   28.306614    1.731295   37.514660  -0.298533  -0.189123  -0.154557  0.604363
-28   Session_02     BAR       -4.000        26.000  -9.936020  10.862339    0.024660   21.563307   10.707292  -15.023836   37.171034  -0.291333  -0.273498   0.070452  0.619812
-29   Session_02   ETH-2       -4.000        26.000  -5.993476  -5.944866  -12.696865  -12.149754  -18.023381  -10.190430   19.913381  -0.713779  -0.298963  -0.064251  0.199436
-30   Session_02     FOO       -4.000        26.000  -0.819742   2.826793    1.317044    5.330616    4.665655   -4.986618   28.903335  -0.612871  -0.329113  -0.018244  0.294481
+24   Session_02   ETH-3       -4.000        26.000   5.757137  11.232751   16.744567   22.398244   28.306614    1.731295   37.514660  -0.298533  -0.189123  -0.154557  0.604363
+25   Session_02     FOO       -4.000        26.000  -0.819742   2.826793    1.317044    5.330616    4.665655   -4.986618   28.903335  -0.612871  -0.329113  -0.018244  0.294481
+26   Session_02   ETH-1       -4.000        26.000   6.019963  10.773112   16.163825   21.331060   27.780042    2.029040   37.042346  -0.692234  -0.324161  -0.051788  0.207075
+27   Session_02     BAR       -4.000        26.000  -9.936020  10.862339    0.024660   21.563307   10.707292  -15.023836   37.171034  -0.291333  -0.273498   0.070452  0.619812
+28   Session_02   ETH-2       -4.000        26.000  -5.993476  -5.944866  -12.696865  -12.149754  -18.023381  -10.190430   19.913381  -0.713779  -0.298963  -0.064251  0.199436
+29   Session_02     FOO       -4.000        26.000  -0.835046   2.870518    1.355370    5.487896    4.665655   -5.004585   28.948243  -0.601666  -0.259900  -0.087592  0.305777
+30   Session_02   ETH-1       -4.000        26.000   6.030532  10.851030   16.245571   21.457100   27.780042    2.037466   37.122284  -0.698413  -0.354920  -0.214443  0.200795
 31   Session_03     BAR       -4.000        26.000  -9.952115  11.034508    0.169809   21.885915   10.707292  -15.002819   37.370451  -0.296804  -0.298351  -0.246731  0.606414
-32   Session_03   ETH-1       -4.000        26.000   6.004078  10.683951   16.045192   21.214355   27.780042    2.010134   36.971642  -0.705956  -0.262026   0.138399  0.193323
-33   Session_03   ETH-2       -4.000        26.000  -6.000290  -5.947172  -12.697463  -12.164602  -18.023381  -10.167221   19.848953  -0.705037  -0.309350  -0.052386  0.199061
-34   Session_03   ETH-1       -4.000        26.000   6.040566  10.786620   16.205283   21.374963   27.780042    2.045244   37.077432  -0.685706  -0.307909  -0.099869  0.213609
-35   Session_03     FOO       -4.000        26.000  -0.823857   2.761300    1.258060    5.239992    4.665655   -4.973383   28.817444  -0.603327  -0.288652   0.114488  0.298751
-36   Session_03   ETH-3       -4.000        26.000   5.718991  11.146227   16.640814   22.243185   28.306614    1.689442   37.449023  -0.277332  -0.169668   0.053997  0.623187
-37   Session_03   ETH-3       -4.000        26.000   5.748546  11.079879   16.580826   22.120063   28.306614    1.723364   37.380534  -0.302133  -0.158882   0.151641  0.598318
-38   Session_03     FOO       -4.000        26.000  -0.873798   2.820799    1.272165    5.370745    4.665655   -5.028782   28.878917  -0.596008  -0.277258   0.051165  0.306090
-39   Session_03     BAR       -4.000        26.000  -9.928709  10.989665    0.148059   21.852677   10.707292  -14.976237   37.324152  -0.299358  -0.242185  -0.184835  0.603855
-40   Session_03   ETH-2       -4.000        26.000  -5.997147  -5.905858  -12.655382  -12.081612  -18.023381  -10.165400   19.891551  -0.706536  -0.308464  -0.137414  0.197550
-41   Session_03     BAR       -4.000        26.000  -9.957114  10.898997    0.044946   21.602296   10.707292  -15.003175   37.230716  -0.284699  -0.307849   0.021944  0.618578
-42   Session_03   ETH-3       -4.000        26.000   5.753467  11.206589   16.719131   22.373244   28.306614    1.723960   37.511190  -0.294350  -0.161838  -0.099835  0.606103
+32   Session_03     BAR       -4.000        26.000  -9.957114  10.898997    0.044946   21.602296   10.707292  -15.003175   37.230716  -0.284699  -0.307849   0.021944  0.618578
+33   Session_03     FOO       -4.000        26.000  -0.823857   2.761300    1.258060    5.239992    4.665655   -4.973383   28.817444  -0.603327  -0.288652   0.114488  0.298751
+34   Session_03   ETH-3       -4.000        26.000   5.753467  11.206589   16.719131   22.373244   28.306614    1.723960   37.511190  -0.294350  -0.161838  -0.099835  0.606103
+35   Session_03   ETH-1       -4.000        26.000   6.040566  10.786620   16.205283   21.374963   27.780042    2.045244   37.077432  -0.685706  -0.307909  -0.099869  0.213609
+36   Session_03   ETH-1       -4.000        26.000   5.994622  10.743980   16.116098   21.243734   27.780042    1.997857   37.033567  -0.684883  -0.352014   0.031692  0.214449
+37   Session_03     BAR       -4.000        26.000  -9.928709  10.989665    0.148059   21.852677   10.707292  -14.976237   37.324152  -0.299358  -0.242185  -0.184835  0.603855
+38   Session_03   ETH-2       -4.000        26.000  -6.000290  -5.947172  -12.697463  -12.164602  -18.023381  -10.167221   19.848953  -0.705037  -0.309350  -0.052386  0.199061
+39   Session_03   ETH-3       -4.000        26.000   5.748546  11.079879   16.580826   22.120063   28.306614    1.723364   37.380534  -0.302133  -0.158882   0.151641  0.598318
+40   Session_03     FOO       -4.000        26.000  -0.873798   2.820799    1.272165    5.370745    4.665655   -5.028782   28.878917  -0.596008  -0.277258   0.051165  0.306090
+41   Session_03   ETH-3       -4.000        26.000   5.718991  11.146227   16.640814   22.243185   28.306614    1.689442   37.449023  -0.277332  -0.169668   0.053997  0.623187
+42   Session_03   ETH-1       -4.000        26.000   6.004078  10.683951   16.045192   21.214355   27.780042    2.010134   36.971642  -0.705956  -0.262026   0.138399  0.193323
 43   Session_03     FOO       -4.000        26.000  -0.800284   2.851299    1.376828    5.379547    4.665655   -4.951581   28.910199  -0.597293  -0.329315  -0.087015  0.304784
-44   Session_03   ETH-2       -4.000        26.000  -6.008525  -5.909707  -12.647727  -12.075913  -18.023381  -10.177379   19.887608  -0.683183  -0.294956  -0.117608  0.220975
-45   Session_03   ETH-1       -4.000        26.000   5.994622  10.743980   16.116098   21.243734   27.780042    1.997857   37.033567  -0.684883  -0.352014   0.031692  0.214449
-46   Session_04   ETH-3       -4.000        26.000   5.739420  11.128582   16.641344   22.166106   28.306614    1.695046   37.399884  -0.280608  -0.210162   0.066645  0.614665
-47   Session_04   ETH-1       -4.000        26.000   6.029937  10.766997   16.151273   21.345479   27.780042    2.018148   37.027152  -0.708855  -0.297953  -0.050465  0.193862
-48   Session_04   ETH-1       -4.000        26.000   6.023822  10.730714   16.121184   21.235757   27.780042    2.012958   36.989833  -0.696908  -0.333582   0.026555  0.205610
-49   Session_04   ETH-3       -4.000        26.000   5.798016  11.254135   16.832228   22.432473   28.306614    1.752928   37.528936  -0.275047  -0.197935  -0.239408  0.620088
-50   Session_04   ETH-2       -4.000        26.000  -5.973623  -5.975018  -12.694278  -12.194472  -18.023381  -10.166297   19.828211  -0.701951  -0.283570  -0.025935  0.207135
-51   Session_04   ETH-2       -4.000        26.000  -5.966627  -5.893789  -12.597717  -12.120719  -18.023381  -10.161842   19.911776  -0.691757  -0.372308  -0.193986  0.217132
-52   Session_04     FOO       -4.000        26.000  -0.853969   2.805035    1.267571    5.353907    4.665655   -5.030523   28.850660  -0.605611  -0.262571   0.060903  0.298685
-53   Session_04     BAR       -4.000        26.000  -9.926078  10.884823    0.060864   21.650722   10.707292  -15.002880   37.185606  -0.287358  -0.232425   0.016044  0.611760
-54   Session_04   ETH-2       -4.000        26.000  -5.986501  -5.915157  -12.656583  -12.060382  -18.023381  -10.182247   19.889836  -0.709603  -0.268277  -0.130450  0.199604
-55   Session_04     BAR       -4.000        26.000  -9.951025  10.951923    0.089386   21.738926   10.707292  -15.031949   37.254709  -0.298065  -0.278834  -0.087463  0.601230
-56   Session_04   ETH-3       -4.000        26.000   5.751908  11.207110   16.726741   22.380392   28.306614    1.705481   37.480657  -0.285776  -0.155878  -0.099197  0.609567
-57   Session_04   ETH-1       -4.000        26.000   6.017312  10.735930   16.123043   21.270597   27.780042    2.005824   36.995214  -0.693479  -0.309795   0.023309  0.208980
-58   Session_04     FOO       -4.000        26.000  -0.848192   2.777763    1.251297    5.280272    4.665655   -5.023358   28.822585  -0.601094  -0.281419   0.108186  0.303128
-59   Session_04     BAR       -4.000        26.000  -9.931741  10.819830   -0.023748   21.529372   10.707292  -15.006533   37.118743  -0.302866  -0.222623   0.148462  0.596536
-60   Session_04     FOO       -4.000        26.000  -0.791191   2.708220    1.256167    5.145784    4.665655   -4.960004   28.750896  -0.586913  -0.276505   0.183674  0.317065
+44   Session_03   ETH-2       -4.000        26.000  -5.997147  -5.905858  -12.655382  -12.081612  -18.023381  -10.165400   19.891551  -0.706536  -0.308464  -0.137414  0.197550
+45   Session_03   ETH-2       -4.000        26.000  -6.008525  -5.909707  -12.647727  -12.075913  -18.023381  -10.177379   19.887608  -0.683183  -0.294956  -0.117608  0.220975
+46   Session_04   ETH-1       -4.000        26.000   6.023822  10.730714   16.121184   21.235757   27.780042    2.012958   36.989833  -0.696908  -0.333582   0.026555  0.205610
+47   Session_04   ETH-3       -4.000        26.000   5.739420  11.128582   16.641344   22.166106   28.306614    1.695046   37.399884  -0.280608  -0.210162   0.066645  0.614665
+48   Session_04     BAR       -4.000        26.000  -9.951025  10.951923    0.089386   21.738926   10.707292  -15.031949   37.254709  -0.298065  -0.278834  -0.087463  0.601230
+49   Session_04     FOO       -4.000        26.000  -0.848192   2.777763    1.251297    5.280272    4.665655   -5.023358   28.822585  -0.601094  -0.281419   0.108186  0.303128
+50   Session_04     BAR       -4.000        26.000  -9.931741  10.819830   -0.023748   21.529372   10.707292  -15.006533   37.118743  -0.302866  -0.222623   0.148462  0.596536
+51   Session_04     FOO       -4.000        26.000  -0.853969   2.805035    1.267571    5.353907    4.665655   -5.030523   28.850660  -0.605611  -0.262571   0.060903  0.298685
+52   Session_04   ETH-3       -4.000        26.000   5.751908  11.207110   16.726741   22.380392   28.306614    1.705481   37.480657  -0.285776  -0.155878  -0.099197  0.609567
+53   Session_04   ETH-3       -4.000        26.000   5.798016  11.254135   16.832228   22.432473   28.306614    1.752928   37.528936  -0.275047  -0.197935  -0.239408  0.620088
+54   Session_04     FOO       -4.000        26.000  -0.791191   2.708220    1.256167    5.145784    4.665655   -4.960004   28.750896  -0.586913  -0.276505   0.183674  0.317065
+55   Session_04   ETH-2       -4.000        26.000  -5.966627  -5.893789  -12.597717  -12.120719  -18.023381  -10.161842   19.911776  -0.691757  -0.372308  -0.193986  0.217132
+56   Session_04   ETH-1       -4.000        26.000   6.017312  10.735930   16.123043   21.270597   27.780042    2.005824   36.995214  -0.693479  -0.309795   0.023309  0.208980
+57   Session_04   ETH-2       -4.000        26.000  -5.986501  -5.915157  -12.656583  -12.060382  -18.023381  -10.182247   19.889836  -0.709603  -0.268277  -0.130450  0.199604
+58   Session_04   ETH-2       -4.000        26.000  -5.973623  -5.975018  -12.694278  -12.194472  -18.023381  -10.166297   19.828211  -0.701951  -0.283570  -0.025935  0.207135
+59   Session_04   ETH-1       -4.000        26.000   6.029937  10.766997   16.151273   21.345479   27.780042    2.018148   37.027152  -0.708855  -0.297953  -0.050465  0.193862
+60   Session_04     BAR       -4.000        26.000  -9.926078  10.884823    0.060864   21.650722   10.707292  -15.002880   37.185606  -0.287358  -0.232425   0.016044  0.611760
 –––  ––––––––––  ––––––  –––––––––––  ––––––––––––  –––––––––  –––––––––  ––––––––––  ––––––––––  ––––––––––  ––––––––––  ––––––––––  –––––––––  –––––––––  –––––––––  ––––––––
 
 
@@ -8119,9 +8679,9 @@ <h1 id="4-api-documentation">4. API Documentation</h1>
 <li><code>l</code>: a list of dictionaries, with each dictionary including at least the keys
 <code>Sample</code>, <code>d45</code>, <code>d46</code>, and <code>d47</code> or <code>d48</code>.</li>
 <li><code>mass</code>: <code>'47'</code> or <code>'48'</code></li>
-<li><code>logfile</code>: if specified, write detailed logs to this file path when calling <code><a href="#D4xdata">D4xdata</a></code> methods.</li>
+<li><code><a href="#D4xdata.logfile">logfile</a></code>: if specified, write detailed logs to this file path when calling <code><a href="#D4xdata">D4xdata</a></code> methods.</li>
 <li><code>session</code>: define session name for analyses without a <code>Session</code> key</li>
-<li><code>verbose</code>: if <code>True</code>, print out detailed logs when calling <code><a href="#D4xdata">D4xdata</a></code> methods.</li>
+<li><code><a href="#D4xdata.verbose">verbose</a></code>: if <code>True</code>, print out detailed logs when calling <code><a href="#D4xdata">D4xdata</a></code> methods.</li>
 </ul>
 
 <p>Returns a <code><a href="#D4xdata">D4xdata</a></code> object derived from <code>list</code>.</p>
@@ -8246,7 +8806,7 @@ <h1 id="4-api-documentation">4. API Documentation</h1>
                             <div id="D4xdata.ALPHA_18O_ACID_REACTION" class="classattr">
                                 <div class="attr variable">
             <span class="name">ALPHA_18O_ACID_REACTION</span>        =
-<span class="default_value">1.008129</span>
+<span class="default_value">np.float64(1.008129)</span>
 
         
     </div>
@@ -8347,6 +8907,61 @@ <h1 id="4-api-documentation">4. API Documentation</h1>
 </div>
 
 
+                            </div>
+                            <div id="D4xdata.verbose" class="classattr">
+                                <div class="attr variable">
+            <span class="name">verbose</span>
+
+        
+    </div>
+    <a class="headerlink" href="#D4xdata.verbose"></a>
+    
+    
+
+                            </div>
+                            <div id="D4xdata.prefix" class="classattr">
+                                <div class="attr variable">
+            <span class="name">prefix</span>
+
+        
+    </div>
+    <a class="headerlink" href="#D4xdata.prefix"></a>
+    
+    
+
+                            </div>
+                            <div id="D4xdata.logfile" class="classattr">
+                                <div class="attr variable">
+            <span class="name">logfile</span>
+
+        
+    </div>
+    <a class="headerlink" href="#D4xdata.logfile"></a>
+    
+    
+
+                            </div>
+                            <div id="D4xdata.Nf" class="classattr">
+                                <div class="attr variable">
+            <span class="name">Nf</span>
+
+        
+    </div>
+    <a class="headerlink" href="#D4xdata.Nf"></a>
+    
+    
+
+                            </div>
+                            <div id="D4xdata.repeatability" class="classattr">
+                                <div class="attr variable">
+            <span class="name">repeatability</span>
+
+        
+    </div>
+    <a class="headerlink" href="#D4xdata.repeatability"></a>
+    
+    
+
                             </div>
                             <div id="D4xdata.make_verbal" class="classattr">
                                         <input id="D4xdata.make_verbal-view-source" class="view-source-toggle-state" type="checkbox" aria-hidden="true" tabindex="-1">
@@ -11786,6 +12401,24 @@ <h5>Inherited Members</h5>
 </div>
 
 
+                            </div>
+                            <div id="D47data.Nominal_D47" class="classattr">
+                                        <input id="D47data.Nominal_D47-view-source" class="view-source-toggle-state" type="checkbox" aria-hidden="true" tabindex="-1">
+<div class="attr variable">
+            <span class="name">Nominal_D47</span>
+
+                <label class="view-source-button" for="D47data.Nominal_D47-view-source"><span>View Source</span></label>
+
+    </div>
+    <a class="headerlink" href="#D47data.Nominal_D47"></a>
+            <div class="pdoc-code codehilite"><pre><span></span><span id="D47data.Nominal_D47-3191"><a href="#D47data.Nominal_D47-3191"><span class="linenos">3191</span></a>	<span class="nd">@property</span>
+</span><span id="D47data.Nominal_D47-3192"><a href="#D47data.Nominal_D47-3192"><span class="linenos">3192</span></a>	<span class="k">def</span> <span class="nf">Nominal_D47</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
+</span><span id="D47data.Nominal_D47-3193"><a href="#D47data.Nominal_D47-3193"><span class="linenos">3193</span></a>		<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">Nominal_D4x</span>
+</span></pre></div>
+
+
+    
+
                             </div>
                             <div id="D47data.D47fromTeq" class="classattr">
                                         <input id="D47data.D47fromTeq-view-source" class="view-source-toggle-state" type="checkbox" aria-hidden="true" tabindex="-1">
@@ -11902,6 +12535,11 @@ <h5>Inherited Members</h5>
                 <dd id="D47data.Nominal_d18O_VPDB" class="variable"><a href="#D4xdata.Nominal_d18O_VPDB">Nominal_d18O_VPDB</a></dd>
                 <dd id="D47data.d13C_STANDARDIZATION_METHOD" class="variable"><a href="#D4xdata.d13C_STANDARDIZATION_METHOD">d13C_STANDARDIZATION_METHOD</a></dd>
                 <dd id="D47data.d18O_STANDARDIZATION_METHOD" class="variable"><a href="#D4xdata.d18O_STANDARDIZATION_METHOD">d18O_STANDARDIZATION_METHOD</a></dd>
+                <dd id="D47data.verbose" class="variable"><a href="#D4xdata.verbose">verbose</a></dd>
+                <dd id="D47data.prefix" class="variable"><a href="#D4xdata.prefix">prefix</a></dd>
+                <dd id="D47data.logfile" class="variable"><a href="#D4xdata.logfile">logfile</a></dd>
+                <dd id="D47data.Nf" class="variable"><a href="#D4xdata.Nf">Nf</a></dd>
+                <dd id="D47data.repeatability" class="variable"><a href="#D4xdata.repeatability">repeatability</a></dd>
                 <dd id="D47data.make_verbal" class="function"><a href="#D4xdata.make_verbal">make_verbal</a></dd>
                 <dd id="D47data.msg" class="function"><a href="#D4xdata.msg">msg</a></dd>
                 <dd id="D47data.vmsg" class="function"><a href="#D4xdata.vmsg">vmsg</a></dd>
@@ -12090,6 +12728,24 @@ <h5>Inherited Members</h5>
 </div>
 
 
+                            </div>
+                            <div id="D48data.Nominal_D48" class="classattr">
+                                        <input id="D48data.Nominal_D48-view-source" class="view-source-toggle-state" type="checkbox" aria-hidden="true" tabindex="-1">
+<div class="attr variable">
+            <span class="name">Nominal_D48</span>
+
+                <label class="view-source-button" for="D48data.Nominal_D48-view-source"><span>View Source</span></label>
+
+    </div>
+    <a class="headerlink" href="#D48data.Nominal_D48"></a>
+            <div class="pdoc-code codehilite"><pre><span></span><span id="D48data.Nominal_D48-3284"><a href="#D48data.Nominal_D48-3284"><span class="linenos">3284</span></a>	<span class="nd">@property</span>
+</span><span id="D48data.Nominal_D48-3285"><a href="#D48data.Nominal_D48-3285"><span class="linenos">3285</span></a>	<span class="k">def</span> <span class="nf">Nominal_D48</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
+</span><span id="D48data.Nominal_D48-3286"><a href="#D48data.Nominal_D48-3286"><span class="linenos">3286</span></a>		<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">Nominal_D4x</span>
+</span></pre></div>
+
+
+    
+
                             </div>
                             <div id="D48data.save_D48_correl" class="classattr">
                                         <input id="D48data.save_D48_correl-view-source" class="view-source-toggle-state" type="checkbox" aria-hidden="true" tabindex="-1">
@@ -12138,6 +12794,11 @@ <h5>Inherited Members</h5>
                 <dd id="D48data.Nominal_d18O_VPDB" class="variable"><a href="#D4xdata.Nominal_d18O_VPDB">Nominal_d18O_VPDB</a></dd>
                 <dd id="D48data.d13C_STANDARDIZATION_METHOD" class="variable"><a href="#D4xdata.d13C_STANDARDIZATION_METHOD">d13C_STANDARDIZATION_METHOD</a></dd>
                 <dd id="D48data.d18O_STANDARDIZATION_METHOD" class="variable"><a href="#D4xdata.d18O_STANDARDIZATION_METHOD">d18O_STANDARDIZATION_METHOD</a></dd>
+                <dd id="D48data.verbose" class="variable"><a href="#D4xdata.verbose">verbose</a></dd>
+                <dd id="D48data.prefix" class="variable"><a href="#D4xdata.prefix">prefix</a></dd>
+                <dd id="D48data.logfile" class="variable"><a href="#D4xdata.logfile">logfile</a></dd>
+                <dd id="D48data.Nf" class="variable"><a href="#D4xdata.Nf">Nf</a></dd>
+                <dd id="D48data.repeatability" class="variable"><a href="#D4xdata.repeatability">repeatability</a></dd>
                 <dd id="D48data.make_verbal" class="function"><a href="#D4xdata.make_verbal">make_verbal</a></dd>
                 <dd id="D48data.msg" class="function"><a href="#D4xdata.msg">msg</a></dd>
                 <dd id="D48data.vmsg" class="function"><a href="#D4xdata.vmsg">vmsg</a></dd>
@@ -12309,6 +12970,24 @@ <h5>Inherited Members</h5>
 </div>
 
 
+                            </div>
+                            <div id="D49data.Nominal_D49" class="classattr">
+                                        <input id="D49data.Nominal_D49-view-source" class="view-source-toggle-state" type="checkbox" aria-hidden="true" tabindex="-1">
+<div class="attr variable">
+            <span class="name">Nominal_D49</span>
+
+                <label class="view-source-button" for="D49data.Nominal_D49-view-source"><span>View Source</span></label>
+
+    </div>
+    <a class="headerlink" href="#D49data.Nominal_D49"></a>
+            <div class="pdoc-code codehilite"><pre><span></span><span id="D49data.Nominal_D49-3329"><a href="#D49data.Nominal_D49-3329"><span class="linenos">3329</span></a>	<span class="nd">@property</span>
+</span><span id="D49data.Nominal_D49-3330"><a href="#D49data.Nominal_D49-3330"><span class="linenos">3330</span></a>	<span class="k">def</span> <span class="nf">Nominal_D49</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
+</span><span id="D49data.Nominal_D49-3331"><a href="#D49data.Nominal_D49-3331"><span class="linenos">3331</span></a>		<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">Nominal_D4x</span>
+</span></pre></div>
+
+
+    
+
                             </div>
                             <div id="D49data.save_D49_correl" class="classattr">
                                         <input id="D49data.save_D49_correl-view-source" class="view-source-toggle-state" type="checkbox" aria-hidden="true" tabindex="-1">
@@ -12357,6 +13036,11 @@ <h5>Inherited Members</h5>
                 <dd id="D49data.Nominal_d18O_VPDB" class="variable"><a href="#D4xdata.Nominal_d18O_VPDB">Nominal_d18O_VPDB</a></dd>
                 <dd id="D49data.d13C_STANDARDIZATION_METHOD" class="variable"><a href="#D4xdata.d13C_STANDARDIZATION_METHOD">d13C_STANDARDIZATION_METHOD</a></dd>
                 <dd id="D49data.d18O_STANDARDIZATION_METHOD" class="variable"><a href="#D4xdata.d18O_STANDARDIZATION_METHOD">d18O_STANDARDIZATION_METHOD</a></dd>
+                <dd id="D49data.verbose" class="variable"><a href="#D4xdata.verbose">verbose</a></dd>
+                <dd id="D49data.prefix" class="variable"><a href="#D4xdata.prefix">prefix</a></dd>
+                <dd id="D49data.logfile" class="variable"><a href="#D4xdata.logfile">logfile</a></dd>
+                <dd id="D49data.Nf" class="variable"><a href="#D4xdata.Nf">Nf</a></dd>
+                <dd id="D49data.repeatability" class="variable"><a href="#D4xdata.repeatability">repeatability</a></dd>
                 <dd id="D49data.make_verbal" class="function"><a href="#D4xdata.make_verbal">make_verbal</a></dd>
                 <dd id="D49data.msg" class="function"><a href="#D4xdata.msg">msg</a></dd>
                 <dd id="D49data.vmsg" class="function"><a href="#D4xdata.vmsg">vmsg</a></dd>
diff --git a/docs/residuals.png b/docs/residuals.png
index a0d6c74..5853cab 100644
Binary files a/docs/residuals.png and b/docs/residuals.png differ
diff --git a/docs/time_distribution.png b/docs/time_distribution.png
index 668173d..4eeee66 100644
Binary files a/docs/time_distribution.png and b/docs/time_distribution.png differ
diff --git a/license.md b/license.md
deleted file mode 100644
index 27be022..0000000
--- a/license.md
+++ /dev/null
@@ -1,13 +0,0 @@
-3-CLAUSE BSD LICENSE
-
-Copyright 2021 Mathieu Daëron, all rights reserved.
-
-Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
-
-1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
-
-2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
-
-3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
\ No newline at end of file
diff --git a/pyproject.toml b/pyproject.toml
index 33d3e01..3b564d2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,19 +1,11 @@
-[build-system]
-requires = ["flit_core >=3.2,<4"]
-build-backend = "flit_core.buildapi"
-
 [project]
 name = "D47crunch"
 authors = [{name = "Mathieu Daëron", email = "mathieu@daeron.fr"}]
-readme = "readme.md"
 dynamic = ["version", "description"]
-license = {text = "BSD-3-Clause"}
-classifiers = [
-	"Programming Language :: Python :: 3",
-	"License :: OSI Approved :: BSD License",
-	"Operating System :: OS Independent",
-]
-requires-python = ">=3.8"
+readme = "readme.md"
+license = {file = "LICENSE"}
+classifiers = ["License :: OSI Approved :: MIT License"]
+requires-python = ">= 3.8"
 dependencies = [
     "numpy >=1.21",
     "scipy >=1.7.0",
@@ -23,6 +15,26 @@ dependencies = [
     "rich",
 ]
 
+[build-system]
+requires = ["flit_core >=3.2,<4"]
+build-backend = "flit_core.buildapi"
+
+[tool.pixi.project]
+channels = ["conda-forge"]
+platforms = ["osx-arm64"]
+
+[tool.pixi.pypi-dependencies]
+D47crunch = { path = ".", editable = true }
+
+[tool.pixi.system-requirements]
+macos = "12.7.5"
+
+[tool.pixi.dependencies]
+pdoc = ">=14.4.0,<15"
+
+[tool.pixi.tasks]
+docs = {cmd = 'python build_doc.py'}
+
 [project.urls]
 Home = "https://github.com/mdaeron/D47crunch"
 Documentation = "https://mdaeron.github.io/D47crunch"
diff --git a/D47crunch/__init__.py b/src/D47crunch/__init__.py
similarity index 99%
rename from D47crunch/__init__.py
rename to src/D47crunch/__init__.py
index 2ab2395..d4d5178 100755
--- a/D47crunch/__init__.py
+++ b/src/D47crunch/__init__.py
@@ -9,9 +9,9 @@
 The **tutorial** section takes you through a series of simple steps to import/process data and print out the results.
 The **how-to** section provides instructions applicable to various specific tasks.
 
-.. include:: ../docs/tutorial.md
-.. include:: ../docs/howto.md
-.. include:: ../docs/cli.md
+.. include:: ../../docpages/tutorial.md
+.. include:: ../../docpages/howto.md
+.. include:: ../../docpages/cli.md
 
 # 4. API Documentation
 '''
@@ -472,13 +472,13 @@ def virtual_data(
 	anchors and unknowns for a bunch of sessions:
 
 	```py
-	.. include:: ../code_examples/virtual_data/example.py
+	.. include:: ../../code_examples/virtual_data/example.py
 	```
 	
 	This should output something like:
 	
 	```
-	.. include:: ../code_examples/virtual_data/output.txt
+	.. include:: ../../code_examples/virtual_data/output.txt
 	```
 	'''