Yes, Jan. The workaround is to import your pre-normlaized data into Athena, and then fix the edge step to 1. I think you might also need to choose the "additional parameters" and uncheck "flatten normalized data" option. With the edge step fixed and no flattening, normalization should leave your data unchanged, allowing you to perform LCF on your pre-processed data without a second round of normalization. --Scott Calvin Sarah Lawrence College On Oct 26, 2012, at 5:15 AM, Stummelfinger wrote: Hi there, Is there a way to do Linear combination fitting in Athena with data which were already proceeded (background corrected and normalized)? I don’t want to do a double background correction /normalization on these data. However the Linear Combination Fitting dialog gives only the option “Norm(E)”. Is there a work around? Thanks a lot, Cheers, Jan