Hi, Troels, this question is mainly for you as I know you have looked at this before. I was wondering if you were able to simultaneously load multiple peak lists via the spectrum.read_intensities user function? I am busy making a tutorial for the manual for how to perform a relaxation dispersion analysis using the GUI, using Flemming Hansen's data in relax. I noticed that the peak intensity wizard in the GUI is having problems, specifically that the file selection dialog for the spectrum.read_intensities user function will only allow single files to be selected, but that the spectrum ID argument allows for a list of spectrum IDs to be supplied. Have you encountered the same problem? If so, how did you solve it? Cheers, Edward