data_Rb2CuF4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.44
_cell_length_b   7.44
_cell_length_c   7.44
_cell_angle_alpha   146.83
_cell_angle_beta   146.83
_cell_angle_gamma   47.62
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Rb2CuF4
_chemical_formula_sum   'Rb2 Cu1 F4'
_cell_volume   122.64
_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
  Rb  Rb0  1  0.0  0.0  0.85  1.0
  Rb  Rb1  1  0.0  0.0  0.76  1.0
  Cu  Cu2  1  0.0  0.0  0.0  1.0
  F  F3  1  0.0  0.0  0.98  1.0
  F  F4  1  0.0  0.0  0.63  1.0
  F  F5  1  0.0  0.12  0.0  1.0
  F  F6  1  0.12  0.0  0.0  1.0

data_Rb2CuF4
_symmetry_space_group_name_H-M   Cm
_cell_length_a   6.0
_cell_length_b   6.0
_cell_length_c   7.44
_cell_angle_alpha   90.0
_cell_angle_beta   113.81
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Rb2CuF4
_chemical_formula_sum   'Rb4 Cu2 F8'
_cell_volume   245.27
_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
  Rb  Rb0  2  0.26  0.5  0.76  1.0
  Rb  Rb1  2  0.35  0.5  0.85  1.0
  Cu  Cu2  2  0.0  0.0  0.0  1.0
  F  F3  4  0.44  0.44  0.88  1.0
  F  F4  2  0.13  0.5  0.63  1.0
  F  F5  2  0.48  0.5  0.98  1.0

Rb Rb Cu F F F F
Rb Rb Cu F F F F 0 5 o o + 0 1 o o o 0 6 o o + 1 4 o o o 2 3 o o - 3 5 o o + 3 6 o o + 5 6 o o o 