[Ifeffit] Farrel Lytle IXAS XAFS database data energy calibration

Dear List Members, I need some nickel reference spectra, and I thought to use the Farrel Lytle IXAS XAFS database. I have found some proper ones, e.g.: http://ixs.csrri.iit.edu/data/Farrel_Lytle_data/RAW/Ni/nifl.090 and http://ixs.csrri.iit.edu/data/Farrel_Lytle_data/RAW/Ni/nicl.047 , but it is not clear from the files how these spectra are energy calibrated. Can somebody help and give some detailed information about it for me? Thank you for your help in advance. Best Regards, Eva Bajnoczi