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Feature/bnayak negxfuboone #2

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The main issues this PR addresses is :

  • nucleon-A events with xF < 0 getting 0% uncertainty in PPFX
  • homogenising treatment for MesonInc and nucleon-A events for xF < 0
  • Hard-coded number of bins in the MesonInc reweighter

It does this by extending the number of bins for the MesonIncident reweighter to 8 in total, going from (-1, 1) instead of (0, 1) before and applying a correlated 40% + uncorrelated 40% across the negative xF bins.

This is the current implementation of PPFX in MicroBooNE with the extra addition of the changes in this PR. This should have a sizeable impact on very off-axis NuMI experiments but negligible for on-axis/nearly on-axis NuMI experiments.

More details are given in the talk to the PPFX WG here

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