4

Si     -0.152831023939791      0.132364143111523     -0.260550608988014
Si      1.321412410944261      1.307720071935693      0.037906810260122
Si      1.233950443858004      0.074931953275442      1.631690458949051
Si      0.232958487201837      1.606370324511794      1.797401007988001