data_[Na2As2F8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  As  2.1800  1.1500  0.6600
  F  3.9800  0.5000  0.7050
]
_symmetry_space_group_name_H-M [Pmn2_1]
_cell_length_a [5.9498]
_cell_length_b [5.7918]
_cell_length_c [5.7007]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [31]
_chemical_formula_structural [NaAsF4]
_chemical_formula_sum '[Na2 As2 F8]'
_cell_volume [196.4450]
_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  2  0.0000  0.9654  0.0985  1.0
  As  As1  2  0.0000  0.4004  0.5263  1.0
  F  F2  4  0.2138  0.2343  0.3709  1.0
  F  F3  2  0.0000  0.1515  0.7515  1.0
  F  F4  2  0.0000  0.6034  0.2539  1.0
]