er, flatter spectrum than you normally get from FM.  If you just push the index up in normal 
FM, the energy is pushed outward in a lumpy sort of fashion, not evenly spread across the spectrum.  
In effect we've turned the axis of the Bessel functions so that the higher order functions start at 
nearly the same time as the lower order functions.  The new function Jn(nB) decreases (very!) gradually.  
For example if the index (B) is 1:
</p>

<!-- LATEX
\begin{eqnarray*}
J_{1}(1) = .440 \\
J_{2}(2) = .353 \\
