tratum. It tolerates duplicates and takes
precedence over the differentiation aesthetics (when <code>aes.bind</code> is not
<code>"none"</code>) and lode guidance with respect to the remaining axes. (It replaces
the deprecated parameter <code>lode.ordering</code>.)
<code>group</code> is used internally; arguments are ignored.
<code>label</code> is used to label the strata or lodes and must take a unique value
across the observations within each stratum or lode.</p>
<p>These and any other aesthetics are aggr