ref-description section level2">
    <p>The <code>[[&lt;-</code> method works for all <a href="oce-class.html">oce</a> objects.
The purpose, as with the related extraction method, <code>[[</code>,
is to insulate users from the internal details of <a href="oce-class.html">oce</a>
objects, by looking for items within the various storage
slots of the object. Items not actually stored can also be
replaced, including units and data-quality
flags.</p>
    </div>

    <div class="section level2">
    <h2 id="ref-u