data_Sr2Se
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.85
_cell_length_b   11.85
_cell_length_c   4.81
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   160.57
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Sr2Se
_chemical_formula_sum   'Sr4 Se2'
_cell_volume   224.44
_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  Sr2  1  1.0  0.49  0.2  1.0
  Sr  Sr3  1  1.0  0.51  0.61  1.0
  Sr  Sr4  1  1.0  0.51  0.2  1.0
  Sr  Sr5  1  1.0  0.49  0.61  1.0
  Se  Se0  1  1.0  0.06  0.2  1.0
  Se  Se1  1  1.0  0.94  0.61  1.0

data_Sr2Se
_symmetry_space_group_name_H-M   P-1
_cell_length_a   4.0
_cell_length_b   4.81
_cell_length_c   11.85
_cell_angle_alpha   90.0
_cell_angle_beta   99.71
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   2
_chemical_formula_structural   Sr2Se
_chemical_formula_sum   'Sr4 Se2'
_cell_volume   224.44
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-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  0.49  0.7  0.49  1.0
  Sr  Sr1  2  0.49  0.3  0.49  1.0
  Se  Se2  2  0.06  0.7  0.06  1.0

Sr Sr Sr Sr Se Se