O Si 
 1.0000000000000000
     5.1503522570683939   -0.0000000000000000   -0.0000000000000000
    -0.0000000000000000    5.1503522570683939    0.0000000000000000
     0.0000000000000000    0.0000000000000000    5.1503522570683939
 O   Si 
   8   4
Selective dynamics
Cartesian
  1.2875880642670985  1.2875880642670985  1.2875880642670985   T   T   T
  3.8627641928012939  3.8627641928012939  1.2875880642670985   T   T   T
  3.8627641928012939  1.2875880642670985  3.8627641928012939   T   T   T
  1.2875880642670985  3.8627641928012939  3.8627641928012939   T   T   T
  1.2875880642670985  1.2875880642670985  3.8627641928012939   T   T   T
  3.8627641928012939  3.8627641928012939  3.8627641928012939   T   T   T
  1.2875880642670985  3.8627641928012939  1.2875880642670985   T   T   T
  3.8627641928012939  1.2875880642670985  1.2875880642670985   T   T   T
  0.0000000000000000  0.0000000000000000  0.0000000000000000   T   T   T
 -0.0000000000000000  2.5751761285341970  2.5751761285341970   T   T   T
  2.5751761285341970  0.0000000000000000  2.5751761285341970   T   T   T
  2.5751761285341970  2.5751761285341970  0.0000000000000000   T   T   T