egated as follows:
Numeric aesthetics, including <code>y</code>, are summed.
Character and factor aesthetics, including <code>label</code>,
are assigned to strata or lodes provided they take unique values across the
observations within each (and are otherwise assigned <code>NA</code>).</p>
    </div>
    <div class="section level2">
    <h2 id="computed-variables">Computed variables<a class="anchor" aria-label="anchor" href="#computed-variables"></a></h2>
    <p>These can be used with
<code><a href="https:/