I'm having a strange problem with my EXAFS fits in Artemis in which they seem to fly off at higher k.  I was having trouble with background fitting a particularly messy data set and I wanted more control over this so I used the program PySpline to fit the background after I did the rest of the preprocessing in Athena.  I then imported the data into Athena and loaded the project into Artemis.  Interestingly, when I only include a single path in the fit and plot both the single path and the overall fit, the single path does not fly off but the overall fit does.  I have attached an image of the issue.  When I use the spline fitting built into athena, I do not encounter this issue.  Has anyone ever experienced this issue before?

Thanks for your help!

Nicholas Weingartz

Ph.D Student

Department of Chemistry

Northwestern University