2</span><span class="p">,</span> <span class="n">alpha</span><span
            class="o">=</span><span class="mf">0.5</span><span class="p">)</span>

        <span class="n">ax</span><span class="o">.</span><span class="n">add_collection</span><span
            class="p">(</span><span class="n">edge_collections</span><span class="p">)</span>
        <span class="n">ax</span><span class="o">.</span><span class="n">set_ylim</span><span class="p">(</span><span
            class="n">y_min</span> <span class="o"