4

Pb      0.188775694522690     -0.264503007874759      0.259716507759720
Pb      1.742742590105009      1.249206870646675      0.258558207803835
Pb      1.745040847933446      0.074373722835586      1.615888489464722
Pb      0.071972444182298      1.735144015432861      1.682475046648767