data_Si2AsSe
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.34
_cell_length_b   4.69
_cell_length_c   5.95
_cell_angle_alpha   90.0
_cell_angle_beta   104.93
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Si2AsSe
_chemical_formula_sum   'Si2 As1 Se1'
_cell_volume   90.11
_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  0.06  0.0  0.1  1.0
  Si  Si3  1  0.46  0.35  0.39  1.0
  As  As0  1  0.02  0.0  0.13  1.0
  Se  Se1  1  0.84  0.35  0.01  1.0

data_Si2AsSe
_symmetry_space_group_name_H-M   P1
_cell_length_a   3.34
_cell_length_b   4.69
_cell_length_c   5.95
_cell_angle_alpha   90.0
_cell_angle_beta   104.93
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Si2AsSe
_chemical_formula_sum   'Si2 As1 Se1'
_cell_volume   90.11
_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  0.06  0.0  0.1  1.0
  Si  Si1  1  0.46  0.35  0.39  1.0
  As  As2  1  0.02  0.0  0.13  1.0
  Se  Se3  1  0.84  0.35  0.01  1.0

Si Si As Se