4

Na      0.042789170664789      0.215272171393449      0.244219625025656
Sn      1.591769158335522      1.564876556623697      0.014771191927495
Sn      1.795534410002176     -0.031035925235180      1.506014570924093
Na     -0.292365283815303      1.421390439186226      1.289017536931626