class at the University of
St Andrews.</p>
    </div>


    <div class="section level2">
    <h2 id="format">Format<a class="anchor" aria-label="anchor" href="#format"></a></h2>
    <p>Data is a <code>list</code> with 4 elements each of which is a <code>data.frame</code>:</p><ul><li><p><code>book.tee.dataframe</code></p><ul><li><p><code>object</code> object ID</p></li>
<li><p><code>observer</code> observer ID</p></li>
<li><p><code>detected</code> detected or not detected</p></li>
<li><p><code>distance</code