4

O      -0.149747312595736     -0.298063940648150      0.019429025014992
Si      1.794170819073454      1.704081112004496      0.018550086950107
Si      1.458871936500739      0.036913835829196      1.206771300154214
O       0.077365690355056      1.725773223142812      1.649777555970285