n class="o">=</span><span class="n">width</span><span class="p">,</span> <span class="n">left</span><span class="o">=</span><span class="n">left</span><span class="p">,</span> <span class="n">color</span><span class="o">=</span><span class="s2">&quot;gray&quot;</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">plt</span><span class="o">.</span><span class="n">gca</span><span class="p">()</span><span cla