span><span class="n">contour</span><span class="p">(</span><span class="n">X1</span><span class="p">,</span> <span class="n">Y1</span><span class="p">,</span> <span class="n">Z1</span><span class="p">,</span> <span class="n">levels</span><span class="o">=</span><span class="n">levels</span><span class="p">,</span> <span class="n">colors</span><span class="o">=</span><span class="n">colors</span><span class="p">,</span> <span class="n">alpha</span><span class="o">=</span><span class="n">alpha</span><span cla