data_BeSeBr2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.1
_cell_length_b   3.1
_cell_length_c   10.65
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   BeSeBr2
_chemical_formula_sum   'Be1 Se1 Br2'
_cell_volume   102.14
_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
  Be  Be0  1  0.0  0.0  0.0  1.0
  Se  Se3  1  0.0  0.0  0.33  1.0
  Br  Br1  1  0.55  0.55  0.55  1.0
  Br  Br2  1  0.55  0.55  0.11  1.0

data_BeSeBr2
_symmetry_space_group_name_H-M   Cm
_cell_length_a   4.38
_cell_length_b   4.38
_cell_length_c   10.65
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   BeSeBr2
_chemical_formula_sum   'Be2 Se2 Br4'
_cell_volume   204.27
_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
  Be  Be0  2  0.0  0.0  0.0  1.0
  Se  Se1  2  0.0  0.0  0.33  1.0
  Br  Br2  2  0.05  0.5  0.11  1.0
  Br  Br3  2  0.05  0.5  0.55  1.0

Be Se Br Br
Be Se Br Br 0 3 - - o 0 3 - o o 0 3 o - o 0 3 o o o 0 1 o o o 1 3 - - o 1 3 - o o 1 3 o - o 1 3 o o o 1 2 - - o 1 2 - o o 1 2 o - o 1 2 o o o 1 1 + o o 1 1 o + o 2 2 + o o 2 2 o + o 