data_Ba2YSe
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.91
_cell_length_b   3.91
_cell_length_c   10.35
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Ba2YSe
_chemical_formula_sum   'Ba2 Y1 Se1'
_cell_volume   158.44
_cell_formula_units_Z   1
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
  Ba  Ba0  1  0.0  0.0  0.94  1.0
  Ba  Ba1  1  0.96  0.96  0.21  1.0
  Y  Y3  1  0.96  0.96  0.94  1.0
  Se  Se2  1  0.0  0.0  0.79  1.0

data_Ba2YSe
_symmetry_space_group_name_H-M   Cm
_cell_length_a   5.53
_cell_length_b   5.53
_cell_length_c   10.35
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Ba2YSe
_chemical_formula_sum   'Ba4 Y2 Se2'
_cell_volume   316.87
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  'x, -y, z'
  3  'x+1/2, y+1/2, z'
  4  'x+1/2, -y+1/2, 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
  Ba  Ba0  2  0.0  0.0  0.94  1.0
  Ba  Ba1  2  0.46  0.5  0.21  1.0
  Y  Y2  2  0.46  0.5  0.94  1.0
  Se  Se3  2  0.0  0.0  0.79  1.0

Ba Ba Y Se
Ba Ba Y Se 0 2 - - o 0 1 - - + 0 3 o o o 1 2 o o - 2 3 + + o 