data_KSe2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.18
_cell_length_b   6.18
_cell_length_c   8.32
_cell_angle_alpha   102.77
_cell_angle_beta   102.77
_cell_angle_gamma   42.27
_symmetry_Int_Tables_number   1
_chemical_formula_structural   KSe2
_chemical_formula_sum   'K2 Se4'
_cell_volume   207.51
_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
  K  K0  1  0.29  0.0  0.73  1.0
  K  K1  1  0.26  0.0  0.35  1.0
  Se  Se2  1  0.18  0.0  0.67  1.0
  Se  Se3  1  0.36  0.0  0.42  1.0
  Se  Se4  1  0.58  0.0  0.11  1.0
  Se  Se5  1  0.97  0.0  0.97  1.0

data_KSe2
_symmetry_space_group_name_H-M   P-1
_cell_length_a   4.45
_cell_length_b   6.18
_cell_length_c   8.32
_cell_angle_alpha   102.77
_cell_angle_beta   90.0
_cell_angle_gamma   111.13
_symmetry_Int_Tables_number   2
_chemical_formula_structural   KSe2
_chemical_formula_sum   'K2 Se4'
_cell_volume   207.51
_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
  K  K0  2  0.0  0.49  0.81  1.0
  Se  Se1  2  0.0  0.19  0.43  1.0
  Se  Se2  2  0.0  0.41  0.12  1.0

K K Se Se Se Se