Hello , please can anyone explain me how calculate net area in root ?

Net area ? what do you mean ?

i need to calculate detector efficiency and the expression of this is

with N IS is the net area at the interest peak energy

I am not sure there is a predefined function in ROOT to compute such formulae.

May be @moneta has an idea about it.

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I suppose that’s the integral? You can use `TF1::Integral()`

if it’s coming from a fit. We’ll need a bit more context to be able to help, as is I might just reply "You want to divide N by A times Ptc? Use `/`

and `*`

"