4

Si     -0.217703046161334      0.020310356140109      0.187453438508874
Si      1.474766946839195      1.379707772205792      0.277115278894340
Si      1.451990547358804      0.136160820792240      1.264292601603787
Si      0.329579409713488      1.719805276800390      1.799776546658485