How to find the area under the peaks in histogram?

ROOT
#1

I have drawn the peaks in the histogram and want to find the area under each peak? please tell me how to proceed?

ROOT Version:6.14
Platform: Ubuntu
Compiler:

#2

https://root.cern/doc/master/classTH1.html#aaf053a4b487c46b9e20c0bf534b34012

#3

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