4

Si      0.256276525846550      0.187671458564909      0.433651331547973
Si      1.262271749705838      1.600377697803879     -0.225390419357339
Si      1.708760174956370     -0.062404429570206      1.456839335024114
Si      0.012005656361401      1.243438680002316      1.539827500606638