read coor pdb HR4435B_NMR_em_bcr3.pdb all rmsd coor heavy 11A-13A,18A-54A,62A-77A ave resOrd_rmsd_heavy rmsd coor backbone 11A-13A,18A-54A,62A-77A ave resOrd_rmsd_bb write best.pdb coor all all pdb quit