Summing different histogramms with different scale

ROOT
1

Hi I need to add 3 thf1 histogramms with different scales and centered at a different values. can someone help me . see the plots

sorro





2

see functions TH1::Add

Rene

3

Dear Rene

It works very well, many thanks. But I am worried that the sum is not correct. Does this function makes automatic the rescalling?
Many thanks
Sorro