"n">projection</span><span class="o">=</span><span class="s1">&#39;3d&#39;</span><span class="p">)</span>
<span class="n">ax</span><span class="o">.</span><span class="n">plot_surface</span><span class="p">(</span><span class="n">X</span><span class="p">,</span> <span class="n">Y</span><span class="p">,</span> <span class="n">f</span><span class="p">,</span> <span class="n">rstride</span><span class="o">=</span><span class="mi">5</span><span class="p">,</span> <span class="n">cstride</span><span class="o">=