data_[Na2Dy2Cu2Se4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Dy  1.2200  1.7500  1.1310
  Cu  1.9000  1.3500  0.8200
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [P2/c]
_cell_length_a [7.1074]
_cell_length_b [4.5606]
_cell_length_c [7.9031]
_cell_angle_alpha [90.0000]
_cell_angle_beta [99.2518]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [13]
_chemical_formula_structural [NaDyCuSe2]
_chemical_formula_sum '[Na2 Dy2 Cu2 Se4]'
_cell_volume [252.8392]
_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  0.5000  0.1531  0.2500  1
  Dy  Dy1  2  0.0000  0.4922  0.7500  1
  Cu  Cu2  2  0.0000  0.0000  0.0000  1
  Se  Se3  4  0.2658  0.3165  0.5351  1
]