lattice_vector           5.64180000        0.00000000        0.00000000
lattice_vector           0.00000000        5.64180000        0.00000000
lattice_vector           0.00000000        0.00000000        5.64180000
atom          0.000000        0.000000        0.000000  Na  
atom          0.500000        0.500000        0.500000  Cl