ee: there’s a <code>seg_wid</code> column representing the width of each segment (usually mapped to the size aesthetic), a <code>seg_col</code> column specifying a colour (usually mapped to the colour aesthetic), etc.</p>
<p>Of particular relevance here is the <code>id_leaf</code> column. This column is a logical variable that is <code>TRUE</code> only for those control points that represent the very tips of the tree: the leaves, essentially. Later on I’m going to plot the tree trunk and leaves separate