e. Required input.</p></dd>


<dt>pal</dt>
<dd><p>Character vector of hex codes.</p></dd>


<dt>alpha_fill</dt>
<dd><p>The opacity of the fill. Defaults to 0.5.</p></dd>


<dt>alpha_line</dt>
<dd><p>The opacity of the outline. Defaults to 1.</p></dd>


<dt>size_line</dt>
<dd><p>The size of the outlines of density areas.</p></dd>


<dt>title</dt>
<dd><p>Title string.</p></dd>


<dt>title_wrap</dt>
<dd><p>Number of characters to wrap the title to. Defaults to 75.</p></dd>


<dt>subtitle</dt>
<dd><p>Subtitle s