pan><span class="p">),</span> <span class="n">delete</span><span class="p">(</span><span class="n">h</span><span class="p">)</span> <span class="p">;</span> <span class="k">end</span>
  <span class="n">h</span> <span class="p">=</span> <span class="n">vl_plotframe</span><span class="p">(</span><span class="n">vl_ertr</span><span class="p">(</span><span class="n">f</span><span class="p">))</span> <span class="p">;</span>
  <span class="k">if</span> <span class="o">~</span><span class="nb">isempty</span><span