O Si 
 1.0000000000000000
     5.0336218610277976   -0.0000000000000000    0.0000000000000000
    -0.0000000000000000    5.0336218610277976   -0.0000000000000000
    -0.0000000000000000   -0.0000000000000000    5.0336218610277976
 O   Si 
   8   4
Selective dynamics
Cartesian
  1.2584054652569492  1.2584054652569492  1.2584054652569492   T   T   T
  3.7752163957708458  3.7752163957708458  1.2584054652569492   T   T   T
  3.7752163957708458  1.2584054652569492  3.7752163957708458   T   T   T
  1.2584054652569492  3.7752163957708458  3.7752163957708458   T   T   T
  1.2584054652569492  1.2584054652569492  3.7752163957708458   T   T   T
  3.7752163957708458  3.7752163957708458  3.7752163957708458   T   T   T
  1.2584054652569492  3.7752163957708458  1.2584054652569492   T   T   T
  3.7752163957708458  1.2584054652569492  1.2584054652569492   T   T   T
  0.0000000000000000  0.0000000000000000  0.0000000000000000   T   T   T
 -0.0000000000000000  2.5168109305138984  2.5168109305138984   T   T   T
  2.5168109305138984 -0.0000000000000000  2.5168109305138984   T   T   T
  2.5168109305138984  2.5168109305138984 -0.0000000000000000   T   T   T