span> <span class="p">[</span><span class="mi">0</span><span class="p">,</span> <span class="o">+</span><span class="mi">1</span><span class="p">]</span> <span class="p">;</span>
<span class="n">axis</span> <span class="n">equal</span> <span class="p">;</span>
<span class="n">xlim</span><span class="p">(</span><span class="n">xl</span><span class="p">)</span> <span class="p">;</span>
<span class="n">ylim</span><span class="p">(</span><span class="n">yl</span><span class="p">)</span> <span class="p">;</span>