Dear @couet, @Wile_E_Coyote,

I have fitted two histograms separately with three-Gaussians (fit1, fit2, fit3). The fits are done with “f(x) = p0 * exp(-0.5 * ((x-p1)/p2)^2)”. Now, I want to compare the ratio (fit1->Integral(bin1,bin2)/totalfit->Integral(bin1,bin2)) from those two histograms.

Is it OK? or I have to fit those histograms with the normalized Gaussian- “f(x) = p0 * exp(-0.5 * ((x-p1)/p2)^2)/(p2 *sqrt(2PI))”? Does the normalising factor (p2 *sqrt(2PI)) in the denominator of the fit function matter, in case of comparing such Integral ratios?

Please clear my confusion.