Avoiding accumulation out-of-range entries in the histogram's first and last bins

[moneta]

HI,

Can you please post a running script so we can understand where the problem is coming from ?
I already answer in this related post

Sum of TF1 in a loop

Hi Lorenzo, This solution looks promising (and efficient), do you need to pass a variable here? i.e. “par” in the definition I didn’t manage to run it In the meantime I figured out a way by basically converting TF1’s to TH1’s then add the histograms: for iev in chain1: Gaus_i.Clear() Gaus_i = ROOT.TF1(“Gaus_i”,“gaus”,100, 200) Gaus_i.SetParameters(1., iev.mean, iev.sigma) Hist_i = Gaus_i.GetHistogram() Hist_tot.Add(Hist_i, iev.weight) And this works, however on the edges of the histo…