) -- required
       win  (duration of the segments) - required. 
       tapers2spec (tapers used for the spectrum of spectrum computation) -
       required in the form [use TW K] - Note that spectrum of the
       spectrum involves computing two Fourier transforms. While the first
       transform (of the original data) is always computed using the
       multi-taper method, the current routine allows the user to specify 
       whether or not to use this method for the second transform. use=1
   