data_[Er2Tm8Cu8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Er  1.2400  1.7500  1.0300
  Tm  1.2500  1.7500  1.0950
  Cu  1.9000  1.3500  0.8200
]
_symmetry_space_group_name_H-M [P4_2/n]
_cell_length_a [8.6420]
_cell_length_b [8.6420]
_cell_length_c [5.6941]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [86]
_chemical_formula_structural [Er(TmCu)4]
_chemical_formula_sum '[Er2 Tm8 Cu8]'
_cell_volume [425.2579]
_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  0.0000  0.0000  1
  Tm  Tm1  8  0.0874  0.3128  0.5983  1
  Cu  Cu2  8  0.1321  0.2746  0.1144  1
]