How to use the code:

First create the histograms:

• root -l
• .L cutoptim.C+
• cutoptim toto(some_ttree)
• toto.Loop()
• .q

If needed, do this for both the sample containing signal (e.g. MC) and the sample containing background (e.g. data)

Then draw them:

• root -l plot.C'("signal.root","background.root")'