I am trying to plot this graph within the range between 0 and 45 on the x axis, so it should appear more narrow [image] truthTree->Draw(“mcDecMuMuY_M/1000>>M_cut5”, “mcDecMuMuY_M>15000 && mcDecMuMuY_M<22000”); This doesn’t give me what I need: M_cut5->GetXaxis()->Set(100,0,45) I tried other num…

Hi Jozefina, You can define histogram binning in TTree::Draw expression: truthTree->Draw(“mcDecMuMuY_M/1000>>M_cut5(100,0,45)”, ... Regards, Sergey

truthTree->Draw(“mcDecMuMuY_M/1000>>M_cut5(100,0,45)”, This still doesnt give me what i need. I have this: [image] and I want to make it look like this: [image]

You forgot to specify cut expression

And probably restart ROOT session - already created histograms will not be rebinned

Could you tell me what “100” stands for?

(100,0,45) is the binning specification for the histogram. 100 bins from 0 to 45. Note that if you need to create more than one histogram, RDataFrame is more efficient although slightly more verbose: it only loops over the data once to create all histograms, while TTree::Draw loops over the data on…

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