data_SiSb
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.16
_cell_length_b   5.18
_cell_length_c   4.52
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SiSb
_chemical_formula_sum   'Si2 Sb2'
_cell_volume   97.37
_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
  Si  Si2  1  0.0  0.0  0.17  1.0
  Si  Si3  1  0.08  0.59  0.35  1.0
  Sb  Sb0  1  0.0  0.59  0.12  1.0
  Sb  Sb1  1  0.08  0.0  0.4  1.0

data_SiSb
_symmetry_space_group_name_H-M   P-1
_cell_length_a   4.16
_cell_length_b   4.52
_cell_length_c   5.18
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   2
_chemical_formula_structural   SiSb
_chemical_formula_sum   'Si2 Sb2'
_cell_volume   97.37
_cell_formula_units_Z   2
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
  Si  Si0  2  0.46  0.41  0.2  1.0
  Sb  Sb1  2  0.46  0.36  0.8  1.0

Si Si Sb Sb