

\subsection{\bf Several Parameters in}
\subsection{\bf Method of Moments---II}

\begin{slide}
\begin{itemize}
\item but still $a_{lm}$ have correlated errors as $\langle Y_{lm}
Y_{l^\prime m^\prime}\rangle \neq \langle Y_{lm} \rangle \langle
Y_{l^\prime m^\prime}\rangle$.

\item For mean is weighted with probability distribution in $\theta$
and $\varphi$, and $Y_{lm}$ are only orthogonal with respect to unit
weight.

\item These correlations in high energy physics example of $d\sigma/dt$
express fact that backward peak ($<<$ forward) comes from correlated
cancellations.

\vspace*{10pt}
\centerline{\psfig{figure=fig13.phys.ps,clip=true,width=3.5in}}
\vspace*{10pt}
\end{itemize}
\end{slide}

