H=<a href="wavespecplot.html">WAVESPECPLOT</a>(...) returns the handles to the subplots. 
 
    [H,HL]=<a href="wavespecplot.html">WAVESPECPLOT</a>(...) also returns the handles to the lines plotted
    in the first panel.
    
    If X is complex-valued, both the real and imaginary parts are plotted 
    in the uppermost subplot.
 
    Usage: h=<a href="wavespecplot.html">wavespecplot</a>(t,x,p,w);
           h=<a href="wavespecplot.html">wavespecplot</a>(t,x,p,w,r);
           [h,hl]=<a href="wavespecplot