data_MnC
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.0
_cell_length_b   3.95
_cell_length_c   2.78
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   MnC
_chemical_formula_sum   'Mn2 C2'
_cell_volume   32.89
_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
  Mn  Mn2  1  0.5  0.0  0.47  1.0
  Mn  Mn3  1  0.0  0.98  0.31  1.0
  C  C0  1  0.0  0.0  0.04  1.0
  C  C1  1  0.5  0.98  0.73  1.0

data_MnC
_symmetry_space_group_name_H-M   P2_1/m
_cell_length_a   2.78
_cell_length_b   3.0
_cell_length_c   3.95
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   11
_chemical_formula_structural   MnC
_chemical_formula_sum   'Mn2 C2'
_cell_volume   32.89
_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, y+1/2, -z'
  4  'x, -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
  Mn  Mn0  2  0.08  0.25  0.51  1.0
  C  C1  2  0.35  0.25  0.49  1.0

Mn Mn C C