read coor pdb PSR293_R3_em_bcr3.pdb all rmsd coor heavy 2A-18A,20A-36A,40A-53A,57A-83A,90A-99A,102A-117A ave resOrd_rmsd_heavy rmsd coor backbone 2A-18A,20A-36A,40A-53A,57A-83A,90A-99A,102A-117A ave resOrd_rmsd_bb write best.pdb coor all all pdb quit