4

Sn     -0.122066349690518     -0.280956139969076     -0.126761631032323
Sn      1.746240972684673      1.643024017571064     -0.145011066979046
Sn      1.610428591776748      0.209471240111462      1.355128506235114
Sn      0.052807135443839      1.413338831542036      1.346554906332897