data_SnSe2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.42
_cell_length_b   5.42
_cell_length_c   2.83
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SnSe2
_chemical_formula_sum   'Sn1 Se2'
_cell_volume   72.0
_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
  Sn  Sn2  1  0.0  0.0  0.0  1.0
  Se  Se0  1  0.0  0.13  0.0  1.0
  Se  Se1  1  0.71  0.56  0.0  1.0

data_SnSe2
_symmetry_space_group_name_H-M   Pm
_cell_length_a   5.42
_cell_length_b   2.83
_cell_length_c   5.42
_cell_angle_alpha   90.0
_cell_angle_beta   120.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   6
_chemical_formula_structural   SnSe2
_chemical_formula_sum   'Sn1 Se2'
_cell_volume   72.0
_cell_formula_units_Z   1
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
  Sn  Sn0  1  0.0  0.0  0.0  1.0
  Se  Se1  1  0.0  0.0  0.13  1.0
  Se  Se2  1  0.71  0.0  0.56  1.0

Sn Se Se