Si 
 1.0000000000000000
     3.8463311945269161    0.0000000000000000   -0.0000000000000000
     0.0000000000000000    3.8463311945269161    0.0000000000000000
    -0.0000000000000000    0.0000000000000000    3.8463311945269161
 Si 
   4
Selective dynamics
Cartesian
  0.0000000000000000  0.0000000000000000  0.0000000000000000   T   T   T
  0.0000000000000000  1.9231655972634585  1.9231655972634585   T   T   T
  1.9231655972634585  0.0000000000000000  1.9231655972634585   T   T   T
  1.9231655972634585  1.9231655972634585  0.0000000000000000   T   T   T