data_C2Se
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.23
_cell_length_b   3.23
_cell_length_c   7.44
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   C2Se
_chemical_formula_sum   'C4 Se2'
_cell_volume   67.4
_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
  C  C0  1  0.62  0.93  0.54  1.0
  C  C1  1  0.0  0.87  0.26  1.0
  C  C2  1  0.62  0.93  0.19  1.0
  C  C3  1  0.0  0.87  0.91  1.0
  Se  Se4  1  0.0  0.0  0.72  1.0
  Se  Se5  1  0.0  0.0  0.0  1.0

data_C2Se
_symmetry_space_group_name_H-M   P1
_cell_length_a   3.23
_cell_length_b   3.23
_cell_length_c   7.44
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   C2Se
_chemical_formula_sum   'C4 Se2'
_cell_volume   67.4
_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
  Se  Se0  1  0.0  0.0  0.0  1.0
  Se  Se1  1  0.0  0.0  0.72  1.0
  C  C2  1  0.0  0.87  0.26  1.0
  C  C3  1  0.0  0.87  0.91  1.0
  C  C4  1  0.62  0.93  0.19  1.0
  C  C5  1  0.62  0.93  0.54  1.0

C C C C Se Se