4

Pb      0.270524516706620      0.268450201658187     -0.270896270287319
Pb      1.731030604753403      1.264943842519280     -0.244008917770377
Pb      1.351804354235199     -0.077489958657116      1.490562578169349
Pb      0.272444251041233      1.289578250079859      1.587971063892737