Hi Alexander, I see two issues with these data files that are probably tripping up Athena: First: the files end with an "END OF DATA" line. This is a fine choice for how to organize a data file, but it's not what Ifeffit is expecting. Second: a bigger issue is that there isn't a column for energy in eV or keV. It looks like the monochromator position is stored in angle (or perhaps I'm misreading the ".dat" files?). Again, this is not what Ifeffit is expecting, and I think this is what is really preventing Athena from processing the data. An Athena plug-in could be made to read these files and do these conversions. There are several example plugins. It would also be pretty easy to write a simple pre-processing script that strips of the last line (the information at the top looks like it would be fine to me) and convert angle to energy. Sorry for the trouble, and hope that helps. --Matt