Deepak, The data files you sent appear to be plots of XAFS |chi(R)|, including offsets for the plotting. That is certainly a reasonable visualization to make for EXAFS data and Demeter can make those easily.
But |chi(R)| is not a histogram of the number of atoms as a function of distance. That is sort of all of "EXAFS analysis" and unfortunately there is not a simple transform that converts |chi(R)| into g(R). I recommend looking at some of the on-line resources and books and review articles on EXAFS. Cheers, --Matt
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