Si2 
1.0
3.8890362179605651e+00 -7.8981791269190399e-16 -6.4715294290050265e-16 
1.9445181089802825e+00 3.3680041609916040e+00 -2.0306373305044008e-16 
1.9445181089802825e+00 1.1226680536638671e+00 3.1753847750688959e+00 
Si 
2 
Cartesian
   3.9101237233    4.4150133847    3.1427830963
   1.9879458625    1.1243974416    0.7991047341
