data_CuAg
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   2.92
_cell_length_b   3.19
_cell_length_c   6.44
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   CuAg
_chemical_formula_sum   'Cu2 Ag2'
_cell_volume   60.05
_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
  Cu  Cu2  1  0.0  0.0  0.63  1.0
  Cu  Cu3  1  0.46  0.6  0.81  1.0
  Ag  Ag0  1  0.0  0.0  0.19  1.0
  Ag  Ag1  1  0.46  0.6  0.25  1.0

data_CuAg
_symmetry_space_group_name_H-M   P-1
_cell_length_a   2.92
_cell_length_b   3.19
_cell_length_c   6.44
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   2
_chemical_formula_structural   CuAg
_chemical_formula_sum   'Cu2 Ag2'
_cell_volume   60.05
_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
  Cu  Cu0  2  0.23  0.3  0.59  1.0
  Ag  Ag1  2  0.23  0.3  0.03  1.0

Cu Cu Ag Ag