O Si 
 1.0000000000000000
     2.7576253382017719    0.0000000000000000   -0.0000000000000000
     0.0000000000000000    2.7576253382017715    0.0000000000000001
    -0.0000000000000000    0.0000000000000001    7.8437152755112658
 O   Si 
   2   1
Selective dynamics
Cartesian
  1.3788126691008864  1.3788126691008862  6.6745704604986793   T   T   T
  1.3788126691008864  1.3788126691008862  1.1691448150125840   T   T   T
  0.0000000000000000  0.0000000000000000  0.0000000000000000   T   T   T