Si2 
1.0
3.8983480604929635e+00 -5.3337489062099873e-16 -5.7135191807573027e-16 
1.9491740302464817e+00 3.3760684531807010e+00 -3.4930731315069896e-16 
1.9491740302464817e+00 1.1253561510602332e+00 3.1829878626587362e+00 
Si 
2 
Cartesian
   1.9883135580    1.1406130637    3.1544686658
   2.0066346947    1.1895579512    0.7673158283
