Problem in plotting several histograms on one same canvas,couldn't show completely

[helena1]

Hello, I want to draw multiple hists on one same graph and I don’t know which hist is the highest, so the graph can’t be shown completely like this ,how should I do?

Thanks!

[dastudillo]

Add them to a THStack, and draw it with the “nostack” option.

[helena1]

I GOT IT ! Thank you so much!