span class="o">.</span><span class="n">percentile</span><span class="p">(</span><span class="n">kde</span><span class="p">,</span> <span class="p">[</span><span class="mi">10</span><span class="p">,</span> <span class="mi">40</span><span class="p">,</span> <span class="mi">68</span><span class="p">,</span> <span class="mi">95</span><span class="p">])</span>

    <span class="c1"># Create a grid for contour plot</span>
    <span class="n">xgrid</span> <span class="o">=</span> <span class="n">np</span><span c