data_NaW
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.76
_cell_length_b   2.63
_cell_length_c   6.51
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   NaW
_chemical_formula_sum   'Na2 W2'
_cell_volume   81.36
_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  0.19  0.0  0.41  1.0
  Na  Na1  1  0.57  0.0  0.1  1.0
  W  W2  1  0.19  0.31  0.01  1.0
  W  W3  1  0.57  0.31  0.5  1.0

data_NaW
_symmetry_space_group_name_H-M   P2
_cell_length_a   4.76
_cell_length_b   2.63
_cell_length_c   6.51
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   3
_chemical_formula_structural   NaW
_chemical_formula_sum   'Na2 W2'
_cell_volume   81.36
_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  0.19  0.0  0.84  1.0
  W  W1  2  0.19  0.31  0.25  1.0

Na Na W W
Na Na W W 0 3 o - o 0 3 o o o 0 0 o + o 0 2 o o o 0 1 o o o 1 2 o - o 1 2 o o o 1 1 o + o 1 3 o o o 2 2 o + o 3 3 o + o 