read coor pdb ZR18_R3_em_bcr3.pdb all rmsd coor heavy 14A-18A,28A-32A,38A-50A,53A-68A,71A-82A ave resOrd_rmsd_heavy rmsd coor backbone 14A-18A,28A-32A,38A-50A,53A-68A,71A-82A ave resOrd_rmsd_bb write best.pdb coor all all pdb quit