data_[Na8Tm4O8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Tm  1.2500  1.7500  1.0950
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [P2_1/c]
_cell_length_a [8.7131]
_cell_length_b [6.3637]
_cell_length_c [6.2518]
_cell_angle_alpha [90.0000]
_cell_angle_beta [96.6247]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [14]
_chemical_formula_structural [Na2TmO2]
_chemical_formula_sum '[Na8 Tm4 O8]'
_cell_volume [344.3279]
_cell_formula_units_Z [4]
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  4  0.0015  0.7237  0.4027  1
  Na  Na1  4  0.2928  0.6121  0.3306  1
  Tm  Tm2  4  0.3577  0.0981  0.3195  1
  O  O3  4  0.1867  0.5910  0.6672  1
  O  O4  4  0.4542  0.1361  0.6639  1
]