I'm trying to do linear combination fitting on a number of samples, and its working well for the most part, with 4 exceptions. There are 4 samples, of 22, that I can't get to sum to 1, despite the fact that I have "sum to 1" checked off before fitting. I've tried reprocessing the data, and tried reinstalling Athena with no luck. Any ideas? Skya Fawcett PhD Candidate Department of Geological Sciences and Geological Engineering Queen's University, Kingston, Canada