p">)</span>

    <span class="n">ax</span><span class="o">.</span><span class="n">grid</span><span class="p">(</span><span class="n">axis</span><span
            class="o">=</span><span class="s1">&#39;y&#39;</span><span class="p">,</span> <span
            class="n">alpha</span><span class="o">=</span><span class="mf">0.8</span><span class="p">)</span>
    <span class="n">ax</span><span class="o">.</span><span class="n">set_xlabel</span><span class="p">(</span><span
            class="n">xlabel</span><span