data_[P4Se2]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  P  2.1900  1.0000  0.5500
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [P2_1/m]
_cell_length_a [5.3422]
_cell_length_b [3.4111]
_cell_length_c [7.9943]
_cell_angle_alpha [90.0000]
_cell_angle_beta [107.4248]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [11]
_chemical_formula_structural [P2Se]
_chemical_formula_sum '[P4 Se2]'
_cell_volume [138.9922]
_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
[
  P  P0  2  0.1211  0.2500  0.1243  1.0
  P  P1  2  0.4681  0.7500  0.9012  1.0
  Se  Se2  2  0.1937  0.7500  0.3334  1.0
]