Si 
 1.0000000000000000
     3.6957512508317998   -0.0000000000000000    0.0000000000000000
    -0.0000000000000000    3.6957512508317998    0.0000000000000000
     0.0000000000000000    0.0000000000000000    3.6957512508317998
 Si 
   4
Selective dynamics
Cartesian
  0.0000000000000000  0.0000000000000000  0.0000000000000000   T   T   T
 -0.0000000000000000  1.8478756254158994  1.8478756254158994   T   T   T
  1.8478756254158994  0.0000000000000000  1.8478756254158994   T   T   T
  1.8478756254158994  1.8478756254158994  0.0000000000000000   T   T   T