O Si 
 1.0000000000000000
     2.8780570753464811    0.0000000000000000   -0.0000000000000000
    -0.0000000000000000    2.8780570753464807   -0.0000000000000001
    -0.0000000000000000   -0.0000000000000003    7.8931134546932489
 O   Si 
   2   1
Selective dynamics
Cartesian
  1.4390285376732408  1.4390285376732403  6.6966764475552365   T   T   T
  1.4390285376732408  1.4390285376732403  1.1964370071380155   T   T   T
  0.0000000000000000  0.0000000000000000  0.0000000000000000   T   T   T