            plot.design <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/c.html" class="external-link">c</a></span><span class="op">(</span><span class="st">"fixed.area"</span>, <span class="st">"k.tree"</span>, <span class="st">"angle.count"</span><span class="op">)</span>,
                  plot.parameters <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/data.frame.html" class="external-link">data.frame</a></span><span class="op">(</span>radius <span cla