Re: using warmabs model in ISIS

From: John Houck <houck_at_email.domain.hidden>
Date: Thu, 6 Jun 2013 12:21:33 -0400
On Thu, Jun 06, 2013 at 10:40 -0400, Michael Nowak wrote:
> The default fit method in XSPEC and ISIS are the same –
> essentially lmdif/mpfit – but the XSPEC version defaults to
> things like smaller fractional step sizes.  One thing that was
> noticed a few years back was that sometimes ISIS had trouble
> fitting lines to HETG data since the fractional step size on a
> parameter was larger than the HETG resolution.

Just to clarify, the default fractional step size in ISIS was
reduced when this problem was reported a few years back, so as
far as I know, that problem has long since been resolved.

Thanks,
-John
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Received on Thu Jun 06 2013 - 12:21:46 EDT

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