Dear Chris, As you suggested that I have run modsel.py again with m0, m1, m2, m3, m4, m5, m9 this time, but relax encountered error again. The error is listed as follow: relax> eliminate(run=None, function=None, args=None) Traceback (most recent call last): File "/usr/local/bin/relax", line 454, in ? Relax() File "/usr/local/bin/relax", line 166, in __init__ self.interpreter.run() File "/data2/usr-local/relax-1.2.9/prompt/interpreter.py", line 213, in run run_script(intro=self.relax.intro_string, local=self.local, script_file=self.relax.scr ipt_file, quit=1) File "/data2/usr-local/relax-1.2.9/prompt/interpreter.py", line 388, in run_script console.interact(intro, local, script_file, quit) File "/data2/usr-local/relax-1.2.9/prompt/interpreter.py", line 340, in interact_script execfile(script_file, local) File "modsel.py", line 20, in ? eliminate() File "/data2/usr-local/relax-1.2.9/prompt/eliminate.py", line 97, in eliminate self.relax.generic.eliminate.eliminate(run=run, function=function, args=args) File "/data2/usr-local/relax-1.2.9/generic_fns/eliminate.py", line 100, in eliminate values = param_values(self.run, i, sim_index=j) File "/data2/usr-local/relax-1.2.9/specific_fns/model_free.py", line 1499, in get_param_ values self.param_vector = self.assemble_param_vector(index=index, sim_index=sim_index) File "/data2/usr-local/relax-1.2.9/specific_fns/model_free.py", line 223, in assemble_pa ram_vector param_vector.append(self.relax.data.res[self.run][i].s2_sim[sim_index]) IndexError: list index out of range Any suggestion what goes wrong? Cheers! Hongyan Dr. Hongyan Li Department of Chemistry The University of Hong Kong Pokfulam Road Hong Kong