loop_
    _restr_plane_id
    _restr_plane_atom_site_label
    _restr_plane_site_symmetry
    _restr_plane_class_id
    _restr_plane_target_weight_param
    _restr_plane_displacement
    _restr_plane_details
      1 c1 1_555 1 0.02   0.002(1) 'c1 to c4 lie on one plane'
      2 c2 1_555 1 0.02  -0.003(2) ?
      3 c3 1_555 1 0.02  -0.002(1) ?
      4 c4 1_555 1 0.02   0.002(2) ?
      5 c1 2_655 2 0.003  0.004(1) 'c1, c5, c6 and c7 lie on one plane'
      6 c5 1_555 2 0.003 -0.002(2) ?
      7 c6 1_555 2 0.003  0.002(3) ?
      8 c7 1_555 2 0.003 -0.002(2) ?