n> <span class='kw'>=</span> <span class='st'>""</span>, <span class='kw'>ylab</span> <span class='kw'>=</span> <span class='st'>""</span>,
  <span class='kw'>height</span> <span class='kw'>=</span> <span class='fl'>600</span>, <span class='kw'>width</span> <span class='kw'>=</span> <span class='fl'>1200</span>) <span class='kw'>%&gt;%</span>

<span class='co'># plot rectangles</span>
<span class='fu'><a href='ly_crect.html'>ly_crect</a></span>(<span class='no'>group</span>, <span class='no'>period</span>, 