O Si 
 1.0000000000000000
     4.4993283436123370   -0.0000000000000000    0.0000000000000000
     0.0000000000000000    4.4993283436123370   -0.0000000000000000
     0.0000000000000000   -0.0000000000000000    3.2308178467259565
 O   Si 
   4   2
Selective dynamics
Cartesian
  1.1021450627730385  1.1021450627730383 -0.0000000000000000   T   T   T
  3.3971832808392999  3.3971832808393003 -0.0000000000000000   T   T   T
  1.1475191090331311  3.3518092345792070  1.6154089233629778   T   T   T
  3.3518092345792070  1.1475191090331307  1.6154089233629778   T   T   T
 -0.0000000000000002 -0.0000000000000002  0.0000000000000000   T   T   T
  2.2496641718061698  2.2496641718061698  1.6154089233629778   T   T   T