Hint
Use the g_confrms program (and select the group "backbone" for fitting), to overlay the x-ray structure with one or a number of NMR structures, and view the result ("fit.pdb") with e.g. rasmol.
Use the g_confrms program (and select the group "backbone" for fitting), to overlay the x-ray structure with one or a number of NMR structures, and view the result ("fit.pdb") with e.g. rasmol.