Hello Everyone, I'm having trouble opening the map file generated by phenix.fem in coot. Each time I try and load the .mtz file the follow error occurs 'Failed to find any suitable F/phi columns in the MTZ file'. Dumping the mtz file I can see: Col Sort Min Max Num % Mean Mean Resolution Type Column num order Missing complete abs. Low High label 1 NONE 0 33 0 100.00 12.1 12.1 114.15 3.31 H H 2 NONE 0 33 0 100.00 12.8 12.8 114.15 3.31 H K 3 NONE 0 137 0 100.00 51.4 51.4 114.15 3.31 H L 4 NONE 0.0 10551.1 22963 71.24 406.13 406.13 39.60 3.31 F 2mFoDFc 5 NONE -180.0 180.0 22963 71.24 0.98 89.81 39.60 3.31 P PHI2mFoDFc 6 NONE 5.2 51589.8 0 100.00 1602.72 1602.72 114.15 3.31 F FEM 7 NONE -180.0 180.0 0 100.00 0.32 89.74 114.15 3.31 P PHIFEM If someone could help me to rename these columns to a coot friendly format so that I would be greatly appreciative. Best, Parker