\begin{table}%t5
\caption{\label{table:7}Parameters for the best-fit model to the observed $^{12}$CO
  and $^{13}$CO line profiles.}            
%\centering
\par
\begin{tabular}{c l c c c c c c c c}    
\hline\hline \noalign{\smallskip}              
& $R_{{\rm i}}$ & $R_{{\rm out}}$ & Mass-loss late
& $f_{{\rm CO}}$ & $V_{{\rm exp}}$ & $T_{0}$  & $\alpha$  & $T_{{\rm bg}}$  \\
              & (10$^{14}$ cm)   & (10$^{14}$ cm)    & ($M_{\odot}$ yr$^{-1}$)
& (10$^{-4}$) &  (km~s$^{-1}$) & (K) &   & (K)   \\
\hline                      
$^{{\rm 12}}$CO & 1 & 630 & 4.7 $\times$ 10$^{-6}$ & 3 & 18 & 40 & 0.8 & 2.7 \\
$^{{\rm 13}}$CO & 1 & 700 & 4.7 $\times$ 10$^{-6}$ & 0.35 & 18 & 50 & 0.8 & 2.7 \\
\hline                             
\end{tabular}
\tablefoot{$R_{\rm i}$ represents the inner
  radius of the envelope, $R_{{\rm out}}$ the outer radius and
  $f_{{\rm CO}}$ = [CO/H$_2$] the CO abundance relative to H$_2$. The
  last three columns give the values for the parameters in
  Eq.~(\ref{eqTemp}). The expansion velocity is derived from the
  $^{12}$CO(3--2) observations.}
\end{table}