O Si 
 1.0000000000000000
     6.6395879052647517    0.0000000000000000   -0.0083443791684209
     0.0000000000000000    4.3183801106925301    0.0000000000000000
    -6.7006704944587758    0.0000000000000000    4.3803633141595517
 O   Si 
   8   4
Selective dynamics
Cartesian
  3.7744722022656489  1.2262051496927802  1.0613474330782939   T   T   T
  0.4241369550362589  3.0921749609997486  3.2515290901580740   T   T   T
 -4.0622997499345113  1.2260449562740181  3.2004788047294430   T   T   T
 -0.7119645027051232  3.0923351544185103  1.0102971476496656   T   T   T
 -0.8046182430762711  0.9553726365507894  3.2443710634925402   T   T   T
  2.5457170041531190  3.3630074741417388  1.0541894064127619   T   T   T
  1.0642971206453540  1.1103957963935001  0.7310460574138963   T   T   T
 -2.2860381265840353  3.2079843142990274  2.9212277144936754   T   T   T
 -0.0625753973166167  2.0080326341970109  4.3329682265573446   T   T   T
  3.2877598499127738  2.3103474764955179  2.1427865694775639   T   T   T
  2.5345623994058082  0.5146483166986140  0.3144157001084422   T   T   T
 -0.8157728478235825  3.8037317939939141  2.5045973571882199   T   T   T