Si 
 1.0000000000000000
     4.1754320499367106    0.0000000000000000    0.0000000000000000
    -0.0000000000000000    4.1754320499367106    0.0000000000000000
     0.0000000000000000    0.0000000000000000    4.1754320499367106
 Si 
   4
Selective dynamics
Cartesian
  0.0000000000000000  0.0000000000000000  0.0000000000000000   T   T   T
 -0.0000000000000000  2.0877160249683557  2.0877160249683557   T   T   T
  2.0877160249683557  0.0000000000000000  2.0877160249683557   T   T   T
  2.0877160249683557  2.0877160249683557  0.0000000000000000   T   T   T