O Si 
 1.0000000000000000
     6.8712406213805748    0.0000000000000000   -0.8219218962418157
     0.0000000000000000    3.0190498590154724   -0.0000000000000000
    -6.9200486573510114   -0.0000000000000000    2.9667761140417506
 O   Si 
   8   4
Selective dynamics
Cartesian
  0.0000000000000000  1.2100390085996957 -0.0000000000000000   T   T   T
 -3.4600243286754946  0.2566508097382127  1.4833880570208764   T   T   T
 -4.1535692537748972  0.2524135094105279  2.5204836745650345   T   T   T
  4.1047612178044579  0.2524135094105279 -0.3756294567650982   T   T   T
 -1.0859781769067323  1.1823769274916023  1.3498854145885879   T   T   T
  1.0371701409362952  1.1823769274916038  0.7949688032113462   T   T   T
  2.0316848890720483  3.2995288734760346  0.6339444203766362   T   T   T
 -2.0804929250424933  3.2995288734760346  1.5109097974232959   T   T   T
 -0.9337616551378253 -0.2985925824647109  2.6379536649628821   T   T   T
  0.8849536191673892 -0.2985925824647112 -0.4930994471629528   T   T   T
  2.5430942781460271  1.7642483749852382  0.1694281225255269   T   T   T
 -2.5919023141164712  1.7642483749852396  1.9754260952744052   T   T   T