<dl><dt><code>fill</code></dt>
<dd><p>the default node fill colour, any R colour or hex value</p></dd>

<dt><code>fontsize</code></dt>
<dd><p>the default font size in points</p></dd>

<dt><code>colour</code></dt>
<dd><p>the default font colour, any R colour or hex value</p></dd>

<dt><code>rankdir</code></dt>
<dd><p>the dot rank direction (one of <code>TB</code>,<code>LR</code>,<code>BT</code>,<code>RL</code>)</p></dd>

<dt><code>rounded</code></dt>
<dd><p>should the node corners be rounded?</p></dd>

<dt><