4

Si      0.157204064909161     -0.234351539188605      0.097193316135148
Si      1.797684540097517      1.482736906663002     -0.139343332569972
Si      1.670896112097038     -0.080201860707234      1.202203182248776
Si      0.262353385949982      1.338809503748273      1.710053546513952