-link">HELPrct</a></span>,</span></span>
<span class="r-in"><span>    width <span class="op">=</span> <span class="fl">0.4</span>, height <span class="op">=</span> <span class="fl">0.4</span>,</span></span>
<span class="r-in"><span>    color <span class="op">=</span> <span class="st">"white"</span></span></span>
<span class="r-in"><span><span class="op">)</span></span></span>
<span class="r-plt img"><img src="gf_density_2d-4.png" alt="" width="700" height="433"></span>
</code></pre></div>
    </div>
  </div