 of real/complex input data
all frequencies are stored. Good for coherence, 
deconvolution, etc.</p>
</dd>
<dt>sk<span class="classifier">ndarray [kspec,nfft]  </span></dt><dd><p>real array with kspec eigenspectra</p>
</dd>
</dl>
<p><strong>Modified</strong></p>
<blockquote>
<div><p>German Prieto
November 2004</p>
</div></blockquote>
<p><strong>Notes</strong></p>
<p>Computes eigen-ft’s by windowing real data with dpss and taking ffts
Note that fft is unnormalized and window is such that its sum of 
square