oves the top decibar (roughly 1m) from
the data.  Specifying <code>pmin</code> is a simple way to remove near-surface
data, such as a shallow equilibration phase, and if specified will cause <code>ctdTrim</code>
to skip step 4 below.</p></li>
<li><p>The maximum pressure is determined, and data acquired subsequent to
that point are deleted.  This removes the upcast and any subsequent data.</p></li>
<li><p>If the <code>pmin</code> parameter is not specified, an attempt is made to remove an initial
equilibrium