Draft: add changes and prepare script necessary for Run3
changes to Fit.py, Dictionaries.py and Plot.py:
- Fit.py: change limits on fractions
- Plot.py: fix bug
- Dictionaries.py: add Run3 lines
changes to run3 folder:
- rename dummy.ymal to dummy.yaml
- add PrepareRun3Sample.C, a script to replace the Prepare step for Run3
- small changes to ntuples_dimuon.py so names fit with Prepare script, only tag lines save as trees and all lines are saved