Re: fit_counts error

On Fri, May 11, 2007 at 10:29 -0400, rgibson_at_email.domain.hidden> I get this error during a call to fit_counts() (shown with Fit_Verbose=1).
> Using ISIS 1.3.0.  This is part of a set of automated fit routines, so I'd like
> to be able to predict that this error is coming and circumvent it before it
> halts the fit (thus halting a series of fits that may have been going on for a
> long time).
>
> Have I done something wrong?  Is there a way to predict the error will occur?
>
> Thanks,
> Rob
[...]
> chisqr= 6.0208e+01:
>  voigt(4).norm=  3.07185834e+07 voigt(4).energy=  4.48342156e-06
>  voigt(4).fwhm=  1.57040638e-01 voigt(4).vtherm=  4.62511027e+03
>
> *** Error:  function evaluation failed
> S-Lang Error: Intrinsic Error: Error while executing __isis_tmp_ffname__

I suspect that the voigt function is failing because the line
center energy is extremely close to zero for the given fwhm and
velocity dispersion.

If that's the problem, one solution would be to increase the
lower bound on the line center energy.

Thanks,
-John
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