ils/Dot/index.html#type-graph_style">Utils.Dot.graph_style</a> list</span> <span class="arrow">&#45;&gt;</span></span>
  <span><a href="#type-t">t</a> <span class="arrow">&#45;&gt;</span></span>
  unit</span></code></div><div class="spec-doc"><p><code>dot_output name fname t</code> writes a .dot representation of tree <code>t</code> with name <code>name</code> in file <code>fname</code>. The aspect of the tree can be adjusted with the <code>options</code> optional argument (see <code>Dot</code>.graph_style)