Saving histograms in a list using PyROOT

[dastudillo]

Instead of adding them to a list, add them to THStack (in that same loop), then just draw the THStack. See this recent post with a similar case:

Overlaying histograms with pyROOT

I am needing to overlay several histograms in several different ROOT files. I am trying to accomplish this in pyROOT. I am first trying just to import a histogram from an existing ROOT file and saving it as a png image. I can’t even seem to get this far. The png saves as just a blank image according to the pixel dimensions I specified. For reference, here is my Python code: import ROOT def overlay_test(): file1 = ROOT.TFile.Open("Baylor/root/local_runs/1050_2023_HB3_ped.root") can…