\begin{picture}(220,60) \multiput(0,6)(2,-6){2}{\line(3,1){150}} \multiput(0,8)(30,6){8}{\line(5,1){10}} \multiput(0,18)(30,6){8}{\line(5,1){10}} \put(45,21){\circle*{3}} \put(55,21){\circle*{3}} \put(65,21){\circle*{3}} \put(75,26){\circle*{3}} \put(82.5,31){\circle*{3}} \put(90,36){\circle*{3}} \put(100,36){\circle*{3}} \put(70,35){$\mathcal{B}$} \put(110,30){\circle{3}} \put(112,21){$P'$} \put(140,36){\vector(0,1){10}} \put(140,62.66){\vector(0,-1){10}} \put(130,55){$\mu$} \put(160,30){\vector(0,1){10}} \put(160,60){\vector(0,-1){10}} \put(164,44){$\mu '$} \end{picture}