OK, I am hopelessly confused about CTYPE1 and CTYPE2 Exactly what should they be for the Mark IV images which have North to the right and RA increasing bottom to top? I assume that CROTA1 and CROTA2 should have values other than 90? On another topic, I passed 9.01E+01 to Rob's program for CROTA1 and CROTA2 and the fits header came back with 9.0 in both places. Sigh! Tom Droege