read coor pdb SGR209C_R3_em_bcr3.pdb all rmsd coor heavy 14A-38A,48A-78A,82A-99A,102A-143A ave resOrd_rmsd_heavy rmsd coor backbone 14A-38A,48A-78A,82A-99A,102A-143A ave resOrd_rmsd_bb write best.pdb coor all all pdb quit