="op">(</span><span class="va">dend</span><span class="op">)</span><span class="op">]</span></span></span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="co"># get some functions:</span></span></span>
<span class="r-in"><span><span class="kw"><a href="https://rdrr.io/r/base/library.html" class="external-link">library</a></span><span class="op">(</span><span class="va"><a href="https://colorspace.R-Forge.R-project.org/" class="external-link">colorspace</a></span><span class="op