4

Sn     -0.021897013468895     -0.214910761360863      0.334818736342247
Sn      1.311035721942915      1.438402219204626      0.193191937243490
Sn      1.290952143878708     -0.185137336960722      1.572046356402500
Sn      0.167561724373242      1.629166423529541      1.573403944094380