n class="op">(</span><span class="va">fam_graph</span>, layout <span class="op">=</span> <span class="va">layout_as_tree</span>,</span>
<span>     vertex.size <span class="op">=</span> <span class="fl">27.5</span>,</span>
<span>     vertex.shape <span class="op">=</span> <span class="st">"rectangle"</span>,</span>
<span>     vertex.label.cex <span class="op">=</span> <span class="fl">.75</span>,</span>
<span>     edge.arrow.size <span class="op">=</span> <span class="fl">.3</span><span class="op">)</span> <