ISIS bug?

From: Gagne, Marc <mgagne_at_email.domain.hidden>
Date: Thu, 21 Jun 2001 15:30:04 -0400
Hello John,

I'm running ISIS 0.9.13 and using the gauss function to fit HEG and MEG
emission lines.  The gauss parameters are yielding very narrow emission
lines, at least twice as narrow as I would expect.  Is FWHM = 2.3548*sigma?
The gauss function described in the isis manual looks like the standard
gaussian (e.g., Bevington) with exponent = -0.5*(x-x0)**2/sigma**2.
However, the gauss_b C function in the ISIS src appears to use erf.  On my
Alpha, erf's exponent is -t**2.  Could this be the problem?

Thanks.

Marc

Marc Gagne
West Chester University
West Chester, PA 19383
(610) 436-3014 
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Received on Thu Jun 21 2001 - 15:30:29 EDT

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