4

Si      0.149777555970285      0.093644321539677      0.273541036547340
Ge      1.532739635050214      1.576759923453861     -0.111965797130296
Ge      1.794978828798281     -0.204001992799793      1.311132695001135
Si      0.291192563847456      1.306912291017673      1.661889860222413