ass="p">(</span><span class="n">y1</span><span class="p">,</span><span class="n">y2</span><span class="p">,</span><span class="n">N2</span><span class="p">)</span>
<span class="n">X</span><span class="p">,</span> <span class="n">Y</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">meshgrid</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">fig</span> <span class="o">=</