data_NaSn
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.58
_cell_length_b   3.58
_cell_length_c   10.78
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   NaSn
_chemical_formula_sum   'Na2 Sn2'
_cell_volume   119.76
_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
  Na  Na0  1  0.79  0.03  0.26  1.0
  Na  Na1  1  0.0  0.07  0.52  1.0
  Sn  Sn2  1  0.79  0.03  0.21  1.0
  Sn  Sn3  1  0.0  0.07  0.57  1.0

data_NaSn
_symmetry_space_group_name_H-M   P-1
_cell_length_a   3.58
_cell_length_b   3.58
_cell_length_c   10.78
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   2
_chemical_formula_structural   NaSn
_chemical_formula_sum   'Na2 Sn2'
_cell_volume   119.76
_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
  Na  Na0  2  0.4  0.98  0.87  1.0
  Sn  Sn1  2  0.4  0.98  0.82  1.0

Na Na Sn Sn
Na Na Sn Sn 0 2 o o o 1 3 o o o 