Hi, It's hard for me to really troubleshoot the problem without seeing the data. It looks like the fit ran to completion, that is, the plot looks OK. A couple of your standards don't actually seem to be represented in your fit. Augite has a negative weight and Olivine is barely outside its error bar. Also, the R factor for fit "B,D,E" is barely different from those above, which further suggests that those two are not actually in your sample. What happens if you exclude those two from the combinatorial fit? Do you see the same error message? What happens if you unclick the button that says "Force weights to sum to 1"? (I suspect that button is the culprit behind the negative weight for Augite) Does the same error message happen if the fit in mu(E) rather than the derivative, as shown? B On 10/14/19 7:00 AM, Clarissa Baldo wrote:

Good Afternoon,

I am a new user of the Athena software.

I am trying to fit my XANES spectra using the linear combination fitting tools in Athena.

However, every time I run the fitting I receive the following warning message:

Would you please give me some advice to solve this problem?

I am using the latest version of the Demeter system (version 0.9.26) for windows.

I have attached a copy of the warning log and a screenshot of the error.

Thanks,

Clarissa

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