equency).
                   If Method='peak', or 'Synch', a flattop window is 
                   assumed to have been used for the spectrum analysis 
                   when calculating the overall level. The first 4 freq.
                   lines are not included in the overall level.
       Method      'Peak' picks the values at each frequency, or 
                   'Hann5' sums RMS values from 5 spectral lines centered
                   on the order in OrderList and if S is complex, averages
        