l="anchor" href="#ref-usage"></a></h2>
    <div class="sourceCode"><pre class="sourceCode r"><code><span><span class="fu">argonDashHeader</span><span class="op">(</span></span>
<span>  <span class="va">...</span>,</span>
<span>  gradient <span class="op">=</span> <span class="cn">TRUE</span>,</span>
<span>  color <span class="op">=</span> <span class="cn">NULL</span>,</span>
<span>  separator <span class="op">=</span> <span class="cn">FALSE</span>,</span>
<span>  separator_color <span class="op">=</span> <s