data_[Sr2Pm2H2Se4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Sr  0.9500  2.0000  1.3200
  Pm  1.1300  1.8500  1.1100
  H  2.2000  0.2500  0.0000
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [P4/nmm]
_cell_length_a [4.1872]
_cell_length_b [4.1872]
_cell_length_c [14.4052]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [129]
_chemical_formula_structural [SrPmHSe2]
_chemical_formula_sum '[Sr2 Pm2 H2 Se4]'
_cell_volume [252.5604]
_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
[
  Sr  Sr0  2  0.0000  0.5000  0.4058  1
  Pm  Pm1  2  0.0000  0.5000  0.8721  1
  H  H2  2  0.0000  0.0000  0.5000  1
  Se  Se3  2  0.0000  0.5000  0.0946  1
  Se  Se4  2  0.0000  0.5000  0.6855  1
]