data_stdin
_audit_creation_method 'critic2-4f1eba8'
_cell_length_a         5.5040000000
_cell_length_b         5.5680000000
_cell_length_c        15.5200000000
_cell_angle_alpha        90.0000
_cell_angle_beta        90.0000
_cell_angle_gamma        90.0000
_cell_volume           475.630141
_space_group_crystal_system orthorhombic
_space_group_IT_number 17
_space_group_name_H-M_alt 'P222_1'
_space_group_name_Hall 'P 2c 2'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '-x,-y,-1/2+z'
  'x,-y,-z'
  '-x,y,-1/2-z'
loop_
_atom_site_label
_atom_site_type_symbol
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
Na     Na     0.00000000000000     0.51900000000000     0.25000000000000
Na     Na     0.50000000000000     0.98100000000000     0.25000000000000
Na     Na     0.51900000000000     0.00000000000000     0.50000000000000
Na     Na     0.98100000000000     0.50000000000000     0.50000000000000
Nb     Nb     0.01400000000000     0.00500000000000     0.37500000000000
Nb     Nb     0.51400000000000     0.50500000000000     0.37500000000000
O      O      0.25000000000000     0.25000000000000     0.37500000000000
O      O      0.75000000000000     0.25000000000000     0.37500000000000
O      O      0.25000000000000     0.75000000000000     0.37500000000000
O      O      0.75000000000000     0.75000000000000     0.37500000000000
O      O      0.00000000000000     0.02500000000000     0.25000000000000
O      O      0.50000000000000     0.47500000000000     0.25000000000000
O      O      0.02500000000000     0.00000000000000     0.50000000000000
O      O      0.47500000000000     0.50000000000000     0.50000000000000
