data_[Pm8Ni26C8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Pm  1.1300  1.8500  1.1100
  Ni  1.9100  1.3500  0.7400
  C  2.5500  0.7000  0.3000
]
_symmetry_space_group_name_H-M [Cmmm]
_cell_length_a [11.8558]
_cell_length_b [12.0732]
_cell_length_c [3.9200]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [65]
_chemical_formula_structural [Pm4Ni13C4]
_chemical_formula_sum '[Pm8 Ni26 C8]'
_cell_volume [561.0958]
_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
[
  Pm  Pm0  4  0.0000  0.3099  0.0000  1
  Pm  Pm1  4  0.1532  0.0000  0.0000  1
  Ni  Ni2  8  0.1086  0.1756  0.5000  1
  Ni  Ni3  8  0.1812  0.3908  0.5000  1
  Ni  Ni4  4  0.1213  0.5000  0.0000  1
  Ni  Ni5  4  0.2500  0.2500  0.0000  1
  Ni  Ni6  2  0.0000  0.5000  0.5000  1
  C  C7  4  0.0000  0.0565  0.5000  1
  C  C8  4  0.2500  0.2500  0.5000  1
]