Normalize each bin of THStack histogram?

[couet]

There is a discussion about this on the forum. Here:

Normalize THSatck

Dear expert, I want to normalize a THStack such that the integral is equal to 1. For the TH1 I used to do: h->Scale(1/h->Integral(“width”)); but the the Scale() or even Integral() are not a member of THStack. Is there a smart way to do that? Regards

It might help you.