Hi everybody, I am trying to use relax for spectral density mapping purpose. I could not find any information on the input format and when I try to use it, although I do not get any error message, nothing has been fitted and my results output file is only made of "none" and "[0,0,0]". I guess my input files were not correct: I used 3 different files (one for R1, one for R2 and one for Noe) with a 'res R err' format. Could anyone help (like sending some input files examples)? thanks and best regards, Fatiha -- Dr. Fatiha Kateb Tel.: +49 89 289-13284 Fax: +49 89 289-13869 Lehrstuhl für Biomolekulare NMR-Spektroskopie Department Chemie, Technische Universität München Lichtenbergstrasse 4 D-85747 Garching