read coor pdb MRR110B_NMR_em_bcr3.pdb all rmsd coor heavy 2A-33A,38A-78A,83A-94A ave resOrd_rmsd_heavy rmsd coor backbone 2A-33A,38A-78A,83A-94A ave resOrd_rmsd_bb write best.pdb coor all all pdb quit