data_[Er2Sn2Se2]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Er  1.2400  1.7500  1.0300
  Sn  1.9600  1.4500  0.8300
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [P4/nmm]
_cell_length_a [4.0823]
_cell_length_b [4.0823]
_cell_length_c [9.0501]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [129]
_chemical_formula_structural [ErSnSe]
_chemical_formula_sum '[Er2 Sn2 Se2]'
_cell_volume [150.8201]
_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
[
  Er  Er0  2  0.0000  0.5000  0.6981  1.0
  Sn  Sn1  2  0.0000  0.0000  0.0000  1.0
  Se  Se2  2  0.0000  0.5000  0.3777  1.0
]