read coor pdb XCR50_R3Cons_em_bcr3.pdb all rmsd coor heavy 3A-7A,13A-34A,37A-55A,58A-74A ave resOrd_rmsd_heavy rmsd coor backbone 3A-7A,13A-34A,37A-55A,58A-74A ave resOrd_rmsd_bb write best.pdb coor all all pdb quit