draft: adding bb4l MCMC SFs reading
It was found out that the MC/MC SFs for btagging are significantly different for the bb4l (pythia8) sample.
The CDI file only exists privately so keeping this MR as draft for now
It was found out that the MC/MC SFs for btagging are significantly different for the bb4l (pythia8) sample.
The CDI file only exists privately so keeping this MR as draft for now