data_stdin
_audit_creation_method 'critic2-4f1eba8'
_cell_length_a         6.3400000000
_cell_length_b         6.3400000000
_cell_length_c         6.3400000000
_cell_angle_alpha        90.0000
_cell_angle_beta        90.0000
_cell_angle_gamma        90.0000
_cell_volume           254.840104
_space_group_crystal_system tetragonal
_space_group_IT_number 111
_space_group_name_H-M_alt 'P-42m'
_space_group_name_Hall 'P -4 2'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  'y,-x,-z'
  '-x,-y,z'
  '-y,x,-z'
  '-x,y,-z'
  '-y,-x,z'
  'x,-y,-z'
  'y,x,z'
loop_
_atom_site_label
_atom_site_type_symbol
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
Hg     Hg     0.00000000000000     0.00000000000000     0.00000000000000
Ag     Ag     0.00000000000000     0.50000000000000     0.50000000000000
I      I      0.27000000000000     0.27000000000000     0.22500000000000
