read coor pdb HR3646E_NMR_em_bcr3.pdb all rmsd coor heavy 24A-44A,48A-82A,84A-102A,105A-113A ave resOrd_rmsd_heavy rmsd coor backbone 24A-44A,48A-82A,84A-102A,105A-113A ave resOrd_rmsd_bb write best.pdb coor all all pdb quit