O Si 
 1.0000000000000000
     6.6457539773918723    0.0000000000000000    0.0400225888665119
     0.0000000000000000    4.3473415104802760    0.0000000000000000
    -6.6701157017242076   -0.0000000000000000    4.3404875760512978
 O   Si 
   8   4
Selective dynamics
Cartesian
  3.7887858592030308  1.2131813367086108  1.0902515201459395   T   T   T
  0.4537280083409113  3.1341601737715692  3.2604953081715968   T   T   T
 -4.0210243195538879  1.2627243272214106  3.2025028295338638   T   T   T
 -0.6859664686918373  3.0846171832587994  1.0322590415081840   T   T   T
 -0.7424072588202550  0.9605719364703570  3.2502853552190532   T   T   T
  2.5926505920418776  3.3867695740098642  1.0800415671933725   T   T   T
  1.0542311175063366  1.0967204164751294  0.7311208339446771   T   T   T
 -2.2808267333557741  3.2506210940051150  2.9013646219703233   T   T   T
 -0.0542489754499582  2.0150975132898559  4.3367915510461259   T   T   T
  3.2808088754121338  2.3322439971903721  2.1665477630204002   T   T   T
  2.5291851795632532  0.4918581883006275  0.3178199556889191   T   T   T
 -0.8058726712988059  3.8554833221795910  2.4880637437145450   T   T   T