Si 
 1.0000000000000000
     6.6798653878983449   -0.0000000000000000   -0.0000000000000000
     0.0000000000000000    6.6798653878983449   -0.0000000000000000
    -0.0000000000000000   -0.0000000000000000    6.6798653878983449
 Si 
  12
Selective dynamics
Cartesian
  1.6699663469745862 -0.0000000000000000  3.3399326939491725   T   T   T
  5.0098990409237585 -0.0000000000000000  3.3399326939491725   T   T   T
  3.3399326939491725  1.6699663469745862 -0.0000000000000000   T   T   T
  3.3399326939491725  5.0098990409237585 -0.0000000000000000   T   T   T
 -0.0000000000000000  3.3399326939491725  1.6699663469745865   T   T   T
 -0.0000000000000000  3.3399326939491725  5.0098990409237585   T   T   T
 -0.0000000000000000  1.6699663469745862  3.3399326939491725   T   T   T
 -0.0000000000000000  5.0098990409237585  3.3399326939491725   T   T   T
  1.6699663469745862  3.3399326939491725 -0.0000000000000000   T   T   T
  5.0098990409237585  3.3399326939491725 -0.0000000000000000   T   T   T
  3.3399326939491725 -0.0000000000000000  5.0098990409237585   T   T   T
  3.3399326939491725 -0.0000000000000000  1.6699663469745865   T   T   T