Si 
 1.0000000000000000
    20.7889393516255154    0.0000000000000000    0.0000000000000000
     0.0000000000000000   20.7889393516255154   -0.0000000000000001
    -0.0000000000000000   -0.0000000000000001   20.7889393516255154
 Si 
  12
Selective dynamics
Cartesian
  5.1972348379063869 -0.0000000000000001 10.3944696758127737   T   T   T
 15.5917045137191472 -0.0000000000000001 10.3944696758127737   T   T   T
 10.3944696758127737  5.1972348379063869 -0.0000000000000000   T   T   T
 10.3944696758127737 15.5917045137191472 -0.0000000000000001   T   T   T
 -0.0000000000000000 10.3944696758127737  5.1972348379063877   T   T   T
 -0.0000000000000000 10.3944696758127737 15.5917045137191472   T   T   T
 -0.0000000000000000  5.1972348379063869 10.3944696758127737   T   T   T
 -0.0000000000000000 15.5917045137191472 10.3944696758127737   T   T   T
  5.1972348379063869 10.3944696758127737 -0.0000000000000001   T   T   T
 15.5917045137191472 10.3944696758127737 -0.0000000000000001   T   T   T
 10.3944696758127737 -0.0000000000000001 15.5917045137191472   T   T   T
 10.3944696758127737 -0.0000000000000000  5.1972348379063877   T   T   T