icients. 
input is the original multitaper weights, 
from the Thomson adaptive weighting. 
vn : ndarray [npts,kspec]  
the Slepian sequences</p>
</dd>
<dt>lambda<span class="classifier">ndarray [kspec]   </span></dt><dd><p>the eigenvalues of the Slepian sequences</p>
</dd>
<dt>nw<span class="classifier">float             </span></dt><dd><p>The time-bandwisth product</p>
</dd>
</dl>
<p><strong>Returns</strong></p>
<dl class="simple">
<dt>qispec<span class="classifier">ndarray [nfft,0]</span></dt><dd><p>the Q