Si 
 1.0000000000000000
     3.9950700777049648    0.0000000000000000   -0.0000000000000000
     0.0000000000000000    3.9950700777049648   -0.0000000000000000
     0.0000000000000000   -0.0000000000000000    3.9950700777049648
 Si 
   4
Selective dynamics
Cartesian
  0.0000000000000000  0.0000000000000000  0.0000000000000000   T   T   T
  0.0000000000000000  1.9975350388524831  1.9975350388524831   T   T   T
  1.9975350388524831 -0.0000000000000000  1.9975350388524831   T   T   T
  1.9975350388524831  1.9975350388524831 -0.0000000000000000   T   T   T