Hi All, Does anyone know whether FEFF can be used to determine whether a crystal is chiral? I am trying to do this for monohydrocalcite (MHC) using the XMCD card. Would this be the correct approach? Also, while I have gotten FEFF to run with the XMCD card in the feff.inp file for other crystals, I keep getting the following error: "FOLP for POTENTIAL type 4 is too big. Reduce overlap using FOLP and rerun." I've tried FOLP 4 1, FOLP 4 0.8, FOLP 4 0.5, and even FOLP 4 0.2, but I keep getting the same error. Has anyone else had this problem and resolved it? Thank you! Ross DeVol University of Wisconsin-Madison