Dear relax-users, I wonder if BIC mode should be chosen for model selection for relaxation data obtained in a single field, while AIC for those data obtained at two field strengths when using RELAX program. Just read Wright PE paper on Journal of Biomolecular NMR 29: 243–257, 2004. Cheers, Hongyan Dr. Hongyan Li Department of Chemistry The University of Hong Kong Pokfulam Road Hong Kong