Si 
 1.0000000000000000
     4.1465819276632470    0.0000000000000000   -0.0000000000000000
    -0.0000000000000000    4.1465819276632470    0.0000000000000000
    -0.0000000000000000    0.0000000000000000    4.1465819276632470
 Si 
   4
Selective dynamics
Cartesian
  0.0000000000000000  0.0000000000000000  0.0000000000000000   T   T   T
 -0.0000000000000000  2.0732909638316230  2.0732909638316230   T   T   T
  2.0732909638316230  0.0000000000000000  2.0732909638316230   T   T   T
  2.0732909638316230  2.0732909638316230  0.0000000000000000   T   T   T