4

Si      0.224750793745531      0.275441401243234     -0.248373670165286
Si      1.781489134533454      1.552100008556937     -0.031354991727867
Si      1.761475170558833      0.007367785376969      1.505055816531102
Si      0.178581111829789      1.583523721294892      1.343762275830894