Hi again Danilo,
if you or they can try it I have my .C macro at
/afs/cern.ch/work/a/anikiten/public/CMSSW_11_0_4/src/HiggsAnalysis/CombinedLimit/test/13TeV_2017UL_RooFitTest_SR3_BERNSTEIN_FTEST.C
and root file with data used by this macro is at the same dir.
you do in interactive root
.L 13TeV_2017UL_RooFitTest_SR3_BERNSTEIN_FTEST.C
Draw()
Thanks, Sasha.