Hi, All experts, I used yhe follwoing code to subtract 2 histograms (a sideband subtraction): TH1F *htemp = (TH1F*)z0hist->Clone(); htemp->Add((TH1 *)z0histsideband,-1/2.4); I think I got the right result except that Nent was reported to be the sum not the difference of the 2 histograms. The integral from htemp->Integral(0,htemp->GetNbinsX()+1 was the right number of entries I expected. Why is Nent incorrect? Thanks, Kai Yi
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