data_PtC3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.17
_cell_length_b   5.17
_cell_length_c   5.17
_cell_angle_alpha   36.69
_cell_angle_beta   36.69
_cell_angle_gamma   36.69
_symmetry_Int_Tables_number   1
_chemical_formula_structural   PtC3
_chemical_formula_sum   'Pt1 C3'
_cell_volume   44.06
_cell_formula_units_Z   1
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  Pt3  1  0.0  0.0  0.22  1.0
  C  C0  1  0.0  0.0  0.0  1.0
  C  C1  1  0.0  0.0  0.31  1.0
  C  C2  1  0.0  0.0  0.13  1.0

data_PtC3
_symmetry_space_group_name_H-M   Cm
_cell_length_a   5.63
_cell_length_b   3.25
_cell_length_c   5.17
_cell_angle_alpha   90.0
_cell_angle_beta   111.31
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   PtC3
_chemical_formula_sum   'Pt2 C6'
_cell_volume   88.12
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  'x, -y, z'
  3  'x+1/2, y+1/2, z'
  4  'x+1/2, -y+1/2, 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  0.0  0.0  0.78  1.0
  C  C1  2  0.0  0.0  0.0  1.0
  C  C2  2  0.0  0.0  0.69  1.0
  C  C3  2  0.0  0.0  0.87  1.0

Pt C C C