 2</SUB>(<I>t</I>)<I>sin</I>2<IMG
 WIDTH="16" HEIGHT="35" ALIGN="MIDDLE" BORDER="0"
 SRC="img2.png"
 ALT="$ \phi$">
and so on, where <I>P</I><SUB>l, m</SUB>=Legendre Polynomials, 
<!-- MATH
 $t = cos\theta = z/r$
 -->
<I>t</I> = <I>cos</I><IMG
 WIDTH="14" HEIGHT="20" ALIGN="BOTTOM" BORDER="0"
 SRC="img3.png"
 ALT="$ \theta$"> = <I>z</I>/<I>r</I>, <!-- MATH
 $\phi= atan(y /x)$
 -->
<IMG
 WIDTH="16" HEIGHT="35" ALIGN="MIDDLE" BORDER="0"
 SRC="img2.png"
 ALT="$ \phi$"> = <I>atan</I>(<I>y</I>/<I>x</I>).

<P>
Da