Dear relax users, I am a new user of the relax and I don't have any background about python. This software seems quite powerful but difficult for me to use. I have collected the T1, T2 and NOE data. Before sending for modelfree calculation, I want to select models residue per residue in order to improve the fitting accuracy as mentioned in P. E. Wright's J.Biomol.NMR paper in 2004 (model-free analysis of protein dynamics: assessment of accuracy and model selection protocols based on molecular dynamics simulation). So I go to the user manual and after several days I got to know how to input the R1, R2 and NOE data (sorry for my slow learning). When I start to do model-selection, the software needs me to provide diffusion tensor but I don't know how to do this. I wonder whether any of you have any protocol for easy usage of model selection. I'm sorry for my silly question and I am looking forward to your reply. Best, Tom Best, Yitao