Hi Lisa, On Fri, Feb 22, 2013 at 4:04 PM, Gudrun Lisa Bovenkamp wrote:

Hey Bruce,

I was wondering how the width in the peak fitting tool of Athena is connected to the real data. What I mean is: A gaussian peak with a width of 1 (eV ?) seems to have a FWHM of 2 eV.

Is it possible that you mean with "the Gaussians (...) are unit normlized (...)" the width is actually "sigma" and the amplitude is actually "mu" in the pure formula?

Thanks, Lisa

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See http://xraypy.github.com/xraylarch/fitting/lineshapes.html for the definition of the Gaussian lineshape used. --Matt