diff --git a/docs/_static/images/savefig/currency1.png b/docs/_static/images/savefig/currency1.png
index ce36406..ba36414 100644
Binary files a/docs/_static/images/savefig/currency1.png and b/docs/_static/images/savefig/currency1.png differ
diff --git a/docs/_static/images/savefig/sgs1.png b/docs/_static/images/savefig/sgs1.png
index 5b3b739..1b14262 100644
Binary files a/docs/_static/images/savefig/sgs1.png and b/docs/_static/images/savefig/sgs1.png differ
diff --git a/docs/_static/images/savefig/taxajuros1.png b/docs/_static/images/savefig/taxajuros1.png
index 446e37c..c1d7747 100644
Binary files a/docs/_static/images/savefig/taxajuros1.png and b/docs/_static/images/savefig/taxajuros1.png differ
diff --git a/poetry.lock b/poetry.lock
index 8993872..dfafe9a 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1464,6 +1464,17 @@ files = [
 [package.dependencies]
 ptyprocess = ">=0.5"
 
+[[package]]
+name = "pickleshare"
+version = "0.7.5"
+description = "Tiny 'shelve'-like database with concurrency support"
+optional = false
+python-versions = "*"
+files = [
+    {file = "pickleshare-0.7.5-py2.py3-none-any.whl", hash = "sha256:9649af414d74d4df115d5d718f82acb59c9d418196b7b4290ed47a12ce62df56"},
+    {file = "pickleshare-0.7.5.tar.gz", hash = "sha256:87683d47965c1da65cdacaf31c8441d12b8044cdec9aca500cd78fc2c683afca"},
+]
+
 [[package]]
 name = "pillow"
 version = "10.3.0"
@@ -2225,4 +2236,4 @@ files = [
 [metadata]
 lock-version = "2.0"
 python-versions = ">= 3.10"
-content-hash = "b97be47973563ee3f988c281eebab7d5f717d75d8ae274ccad16d94820a7e152"
+content-hash = "1dab0bf4b16c0cb98441565d6c3c3a35c8f6b72fc28105aa8f86ef80ed9a15d8"
diff --git a/pyproject.toml b/pyproject.toml
index a91bd33..b195a88 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -23,6 +23,7 @@ pydata-sphinx-theme = ">= 0.10.1"
 matplotlib = ">= 3.5.3"
 ipython = ">= 8.14.0"
 furo = ">= 2022.6.21"
+pickleshare = "^0.7.5"
 
 [tool.poetry.group.dev.dependencies]
 pycodestyle = ">= 2.9.1"