data_[Pm8Er4C8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Pm  1.1300  1.8500  1.1100
  Er  1.2400  1.7500  1.0300
  C  2.5500  0.7000  0.3000
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [13.1455]
_cell_length_b [3.6784]
_cell_length_c [10.2889]
_cell_angle_alpha [90.0000]
_cell_angle_beta [114.2115]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Pm2ErC2]
_chemical_formula_sum '[Pm8 Er4 C8]'
_cell_volume [453.7531]
_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
[
  Pm  Pm0  4  0.0179  0.5000  0.2635  1
  Pm  Pm1  4  0.1748  0.0000  0.1003  1
  Er  Er2  4  0.1886  0.0000  0.5833  1
  C  C3  4  0.0545  0.5000  0.5337  1
  C  C4  4  0.1619  0.0000  0.3298  1
]