alue<a class="anchor" aria-label="anchor" href="#value"></a></h2>
    <p>invisible()</p>
    </div>
    <div class="section level2">
    <h2 id="note">Note<a class="anchor" aria-label="anchor" href="#note"></a></h2>
    <p>Here we also pass '...' to group_2d_grid() (to easily adjust
      font size etc.)</p>
    </div>
    <div class="section level2">
    <h2 id="author">Author<a class="anchor" aria-label="anchor" href="#author"></a></h2>
    <p>Marius Hofert and Wayne Oldford</p>
    </div>

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