data_PtC
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.06
_cell_length_b   4.05
_cell_length_c   3.83
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   PtC
_chemical_formula_sum   'Pt2 C2'
_cell_volume   47.42
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Pt  Pt2  1  0.53  0.0  0.9  1.0
  Pt  Pt3  1  0.0  0.03  0.93  1.0
  C  C0  1  0.0  0.0  0.33  1.0
  C  C1  1  0.53  0.03  0.49  1.0

data_PtC
_symmetry_space_group_name_H-M   P-1
_cell_length_a   3.06
_cell_length_b   3.83
_cell_length_c   4.05
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   2
_chemical_formula_structural   PtC
_chemical_formula_sum   'Pt2 C2'
_cell_volume   47.42
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-x, -y, -z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Pt  Pt0  2  0.24  0.01  0.51  1.0
  C  C1  2  0.24  0.42  0.49  1.0

Pt Pt C C