I am using the gaussin fitting functions in the Matlab curve fitting toolbox, which uses the model:
ans(x) = a1*exp(-((x-b1)/c1)^2) + a2*exp(-((x-b2)/c2)^2)
This all works well for my data and I get the fits, but now I want to know what sigma is for these two gaussians? That isn't just c, is it? Can someone tells me how the fit coefficients relate to sigma?