Query on Integral() option

[Wile_E_Coyote]

You can play with the two macros given in the post linked below (the first one uses “gausn”, the second one “gaus”, the required “60Codata.txt” file is attached in another post in the same thread).

TH1F variable bin width

Using the "60Codata.txt" file (attached in another post here), try this: { const Bool_t fit_with_fixed_background = kFALSE; // kFALSE or kTRUE const char *filename = "60Codata.txt"; TGraph *g0 = new TGraph(filename, "%lg %lg %*lg"); // X axis = channels g0->SetTitle("g0;Channel number;Energy"); // energy calibration TGraph *g1 = new TGraph(filename, "%lg %*lg %lg"); // X axis = channels g1->SetTitle("g1;Channel number;Counts"); TGraph *g2 = new TGraph(filename, "%*lg %lg %lg");…