Si 
 1.0000000000000000
    16.9740979141689081   -0.0000000000000000    0.0000000000000000
    -0.0000000000000000   16.9740979141689081   -0.0000000000000001
    -0.0000000000000000   -0.0000000000000001   16.9740979141689081
 Si 
   8
Selective dynamics
Cartesian
 -0.0000000000000000  0.0000000000000000  0.0000000000000000   T   T   T
 -0.0000000000000000  8.4870489570844594  8.4870489570844594   T   T   T
  8.4870489570844594  8.4870489570844594 -0.0000000000000000   T   T   T
  8.4870489570844594 -0.0000000000000000  8.4870489570844594   T   T   T
 12.7305734356267148  4.2435244785422297 12.7305734356267148   T   T   T
  4.2435244785422288  4.2435244785422297  4.2435244785422288   T   T   T
  4.2435244785422288 12.7305734356267148 12.7305734356267148   T   T   T
 12.7305734356267148 12.7305734356267148  4.2435244785422288   T   T   T