data_SiSe2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.51
_cell_length_b   3.51
_cell_length_c   6.61
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SiSe2
_chemical_formula_sum   'Si1 Se2'
_cell_volume   70.54
_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
  Si  Si2  1  0.0  0.0  0.0  1.0
  Se  Se0  1  0.0  0.03  0.44  1.0
  Se  Se1  1  0.76  0.01  0.17  1.0

data_SiSe2
_symmetry_space_group_name_H-M   P1
_cell_length_a   3.51
_cell_length_b   3.51
_cell_length_c   6.61
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SiSe2
_chemical_formula_sum   'Si1 Se2'
_cell_volume   70.54
_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
  Si  Si0  1  0.0  0.0  0.0  1.0
  Se  Se1  1  -0.0  0.03  0.44  1.0
  Se  Se2  1  0.76  0.01  0.17  1.0

Si Se Se
Si Se Se 0 2 - o o 1 2 - o o 