class="std std-ref">whichCov</span></a>, <a class="reference internal" href="#kalmanfilter-uniquecovariances-outputs-ncov"><span class="std std-ref">nCov</span></a>] = obj.uniqueCovariances(<a class="reference internal" href="#kalmanfilter-uniquecovariances-inputs-t"><span class="std std-ref">t</span></a>)</div>
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</pre><p>Given a set of queried assimilation time steps, determines which of the queried time steps share a unique covariance estimate. Also returns the total number of unique covariance esti