Hi Gerrit,

I just started to use Artemis again and at the moment I am a bit confused about the results. In one Artemis experiment I just select two FEFF-paths and choose a "sum of paths" which produces the result shown in the appended picture (SumOfPaths2). Shouldn't the fit be more or less look like the sum of the two paths?

In the R-space plots you show, you're plotting the magnitude of chi(R), which don't add together simply. Plotting chi(k) or the real / imaginary parts of chi(R) should show the sum more simply.

I also exported both paths as chi(k)-data and manually added them which produced the same result as the chi(k) of the fit. But when I use more paths I get a different result: the manually summed chi has a greater amplitude (see chi.png). Could that be related to the fact that the fit parameters are applied to the sum of path but not to the exported paths?

The fit and path parameters are definitely applied to the individual paths. I think they should be applied to the chi(k) as well, but it might depend on how you exported the data. --Matt