How to find integral in RooFit?

Dear RooFit Experts

I have a Z->ee histogram which I have fitted with a Voigtian convolved
with a Crystal Ball function, with an exponential function modelling the background.
Now I want to know what is the difference in Integral calculated from histogram and Integral from the fitted curve. I know for histogram histo->Integral() will serve the purpose but I could not find any function for fitted curve which will return me the integral under the fitted curve.
Kindly let me if there is some function / recipe to implement this.

Thanks & Regards

Hi Raman,

Did you resolve your issue? If not, I recommend that you post your question in the Math and Stats forum.