4

Sn      0.262353385949982     -0.151619035211274      0.210053546513952
Sn      1.712117311544644      1.449686900481197      0.295946725469784
Sn      1.657104594115611     -0.009571461040452      1.356871985592266
Sn      0.241229004970342      1.522012931688855      1.316343479303719