data_[Na2Se2O4F2]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Se  2.5500  1.1500  1.0133
  O  3.4400  0.6000  1.2600
  F  3.9800  0.5000  0.7050
]
_symmetry_space_group_name_H-M [P2_1/m]
_cell_length_a [4.2271]
_cell_length_b [5.5658]
_cell_length_c [6.4221]
_cell_angle_alpha [90.0000]
_cell_angle_beta [108.3782]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [11]
_chemical_formula_structural [NaSeO2F]
_chemical_formula_sum '[Na2 Se2 O4 F2]'
_cell_volume [143.3893]
_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  0.1701  0.2500  0.3363  1
  Se  Se1  2  0.3999  0.2500  0.8470  1
  O  O2  4  0.3310  0.0116  0.6819  1
  F  F3  2  0.1083  0.7500  0.0686  1
]