Are you using NMAPS > 0 or < 0 in VPLOT? I am not feeling well and am about to go home for the day - but I will try to look at this soon. It is a bit odd in that IBLED itself has not changed from 15OCT99 to 31DEC99 and it computes the model internally without using any special subroutines. I will probably need to fetch your images and data. Thanks, ERic