Question 1: As explained here: https://bruceravel.github.io/demeter/documents/Artemis/feff/paths.html#path-... the plot made form the paths tab of the Feff window make no effort to set parameters like S02 and sigma^2 to sensible values. The plots made from the Data window probably have values for S02 and sigma^2 not equal to 1 and 0, respectively. Question 2: See https://speakerdeck.com/bruceravel/the-ramsauer-townsend-effect-in-x-ray-abs... a topic which is also explained in many other places by many other people. B On 1/10/21 9:49 PM, Huaming wrote:

Dear all,

I am using Artemis for EXAFS data fittingand found that the |χ(R)| plot shown in "Artemis [Plot]" and "Artemis [Feff] Atoms and Feff" are in great difference for a same scattering path. However, the |χ(k)| plots shown in the above two windows is the same.   For the plot shown in "Artemis [Feff] Atoms and Feff" window, one path is selected and 'Plot path' is clicked. For the plot shown in "Artemis [Plot]", the same path is dragged into the "Artemis window" and then transfered path and plot in R by click "Action" menu.  I would like to know what is the difference of data shown in the two windows.

BTW, whether it is possible to have two peaks in the |chi(R)| plot for a single scattering path? For some scatters with high-Z, the f(k) may feature multiple peaks.

Thanks,

All bests,

Huaming Hou

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-- Bruce Ravel ------------------------------------ bravel@bnl.gov National Institute of Standards and Technology Synchrotron Science Group at NSLS-II Lead Beamline Scientist, 6BM (BMM) Building 743, Room 114 Upton NY, 11973 Homepage: http://bruceravel.github.io/home/ Beamline: https://www.bnl.gov/ps/beamlines/beamline.php?r=6-BM Software: https://github.com/bruceravel Demeter: http://bruceravel.github.io/demeter/