Overlay two histograms drawn by two . root files on one canvas

I have two . root files and draw histograms according to the data in them. I want to put these two histograms on the same canvas for comparison. What should I do?

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ROOT Version: 6.23/01
Platform: Centos7
Compiler: GCC 8.3.1

Draw the first one and then draw the second with the “same” option, e.g. h2->Draw(“same”), or (a safer bet) put them in a THStack and draw the stack with the “Nostack” option.

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