data_RbC2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.48
_cell_length_b   4.48
_cell_length_c   7.23
_cell_angle_alpha   101.66
_cell_angle_beta   101.66
_cell_angle_gamma   84.1
_symmetry_Int_Tables_number   1
_chemical_formula_structural   RbC2
_chemical_formula_sum   'Rb2 C4'
_cell_volume   139.09
_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
  Rb  Rb4  1  0.74  0.0  0.14  1.0
  Rb  Rb5  1  0.95  0.0  0.82  1.0
  C  C0  1  0.36  0.0  0.04  1.0
  C  C1  1  0.09  0.0  0.63  1.0
  C  C2  1  0.6  0.0  0.33  1.0
  C  C3  1  0.33  0.0  0.92  1.0

data_RbC2
_symmetry_space_group_name_H-M   P-1
_cell_length_a   4.48
_cell_length_b   4.48
_cell_length_c   7.23
_cell_angle_alpha   78.34
_cell_angle_beta   78.34
_cell_angle_gamma   84.1
_symmetry_Int_Tables_number   2
_chemical_formula_structural   RbC2
_chemical_formula_sum   'Rb2 C4'
_cell_volume   139.09
_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
  Rb  Rb0  2  0.11  0.0  0.66  1.0
  C  C1  2  0.25  0.0  0.85  1.0
  C  C2  2  0.49  0.0  0.56  1.0

Rb Rb C C C C