[Chimera-users] FoxS in Chimera for SAXS curve fitting

Ben Webb ben at salilab.org
Tue Aug 4 17:20:39 PDT 2015

On 08/03/2015 10:51 AM, Eugene Valkov wrote:
> Thanks for a quick response and for clarifying this a bit. However, I am
> still none the wiser as to why there is a discrepancy between the SAXS
> fits reported by the version Chimera uses and the FoxS from the IMP
> suite or the Sali lab webserver.

Dina would be the person to ask (since she wrote FoXS). Her contact 
details are on the FoXS website.

Chimera folks: I'm not sure why the version of FoXS you're using is so 
old (if it's really IMP 2.1, that was released in 2013). If possible, 
Chimera should just talk directly to the Sali lab FoXS webserver. If 
that's not practical, it should be straightforward to update your web 
service to use the latest IMP 2.5.0 release.

> For the record, I think Chimera reports
> the more accurate values as they are in rough agreement with those from
> another program, Crysol.

It's far more likely that you're seeing overfitting here. That was 
certainly an issue in older versions of FoXS, long since fixed at our end.

ben at salilab.org                      http://salilab.org/~ben/
"It is a capital mistake to theorize before one has data."
	- Sir Arthur Conan Doyle

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