4

Pb      0.279792691339839     -0.136238093628964      0.267212198611071
Pb      1.234374662294474      1.452128446212996      0.297658478223531
Pb      1.310626536378058      0.101476152006307      1.789321140313063
Pb     -0.014745937358629      1.793374551526511      1.762758125252895