Hi Bruce, just to throw another one in :) ATHENA has the following problem - I make a linear combination fit of two spectra and put the result in a group. Then I want to export it using the "save groups as..." and.... just get zero's in the file. Using the IFEFFIT buffer and saving the corresponding array with the write_data() command works fine - maybe there's a renaming bug of the corresponding array? Furthermore, the fit looks shifted as soon as written to an array. When I fit (the 3rd spectrum in the example with a LC of the first two) everything looks nice. The saved LC is, however, shifted compared to the one seen during the fit. Furthermore, I cannot change any parameter of this (LC) group... Cheers, Norbert -- Dr. rer. nat. Norbert Weiher (norbert.weiher@manchester.ac.uk) School of Chemical Engineering and Analytical Science Sackville Street, Manchester, M60 1QD - Phone: +44 161 306 4468