Fitting a Gaussian function.

Can someone help me with the MATLAB Gaussian function. It looks like the denominator in the argument of the exponential is "c^2"; however, a Gaussian function has "2*c^2" in this place. The difference is significant enough to note. Am I looking at the wrong Gaussian fit model in the fit toolbox, or is this the model? If it is the model, how can you reconcile the factor of 2 missing?

Thanks,

Cal

[José-Luis]

Callen, please remember that we are not looking at your screen. Which Gaussian function?

If you make it easy for us to help you, you might get better answers..