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