read coor pdb SR213_NMR_em_bcr3.pdb all rmsd coor heavy 7A-26A,42A-64A,70A-93A,97A-120A ave resSel_rmsd_heavy rmsd coor backbone 7A-26A,42A-64A,70A-93A,97A-120A ave resSel_rmsd_bb write selSi.pdb coor all all pdb quit