4

Si      0.273830664784013      0.358303340895058      0.100311516002597
O       1.483088997025454      1.354318699447148     -0.031051318214482
Si      1.635280018970189      0.057915308048534      1.233874956727468
O       0.085019267238843      1.566033883699816      1.455255389631302