of length the
number of rows of <code>data</code>) or NULL entries (indicating no imposed ordering),
or else a numeric matrix of corresponding dimensions, giving the preferred
ordering of alluvia at each axis. This will be used to order the lodes
within each stratum by sorting the lodes first by stratum, then by the
provided vectors, and lastly by remaining factors (if the vectors contain
duplicate entries and therefore do not completely determine the lode
orderings).</p></dd>


<dt id="arg-aes-bind">aes.bi