\begin{table}%t5
\par
\caption {\label{tab:modelparms}Best-fit parameters of the $r^{-2}$ shell model applied to
the continuum spectra of the compact and extended radio components of
W9.}
%\centerline
 {\begin{tabular}{lllll}
\hline\hline
\noalign{\smallskip}
Model &Component & $\dot M$~$M_\odot$~yr$^{-1}$ & $R_{\rm i}$ & $R_{\rm o}$ \\
      &          & $(\times 10^{-5})$& (AU) & (AU)\\
\hline 
1 &Compact & $\rm 8.7^{+0.5}_{-0.2}$ & $0$ & $\rm 5800^{+7200}_{-1200}$ \\
2 &Extended& $\rm 17.6^{+0.5}_{-0.4}$ & $\rm 1100^{+80}_{-90}$ & $\infty$\\
3 &Compact & $\rm 9.2^{+0.4}_{-0.5}$ & $0$ & $\rm 4000^{+3000}_{-900}$ \\
3 &Extended & $\rm 33^{+12}_{-5}$ &$\rm 4000^{+3000}_{-900}$ & $\infty$\\
\hline
\end{tabular}}
\tablefoot{Models 1 and 2 correspond to best-fits of each individual
spectra. Model 3 assumes the outer radius of the compact component is
equal to the inner radius of the extended component.  For each model
it is assumed that $T_{\rm e}=10$~kK, $v_\infty=200$~km~s$^{-1}, $Z=0.9$,
\mu=1.5$, $\gamma=0.8$ and the volume filling factor
$f=1$.}
\end{table}