ngauss

This function is a sum of gaussians plus a constant. It uses a variable number of parameters. The number you want must be chosen when you select the function. The function has the form:

f (x) = ai+2e-($\scriptstyle {\frac{{x-a_{i}}}{{a_{i+1}}}}$)2 + an-1.

You must choose 3n + 1 parameters, where n is the number of gaussians you want. This function converges slowly for more than 2 gaussians, but it usually does converge. If the peaks in your data are separated by several widths, you should window the data and fit the peaks separately first, and then do a final fit on the whole data set.