>count</code>, and <code>prop</code> are calculated after the
data are grouped by <code>x</code> and weighted by <code>weight</code> (in addition to <code>y</code>).
The integer variable <code>deposit</code> is used internally to sort the data before
calculating heights. The character variable <code>lode</code> is obtained from
<code>alluvium</code> according to <code>distill</code>.</p>
    </div>
    <div class="section level2">
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