\begin{table}%t3 
%\centering
\par
\caption{Summary of the dust radiative transfer analysis.\label{best_fit_param}}
  \begin{tabular}[bt]{lccc}
    \hline   \hline
    Quantity          & Shu-like model & Power-law model & \citet{Sch02} \\ \hline
    \multicolumn{4}{c}{${\rm Best-fit~parameters}$} \\
    $L_*$ ($L_\odot$)  & 22             & 22   & 27 \\
    $D$ (pc)             & 120            & 120  & 160\\
    $\tau_{100}$       & 2.0            & 3.0  & 4.5\\
    $r_{\rm inf}$ (AU)     & 1280           &  &  \\
    $\alpha$          &                & 1.8 & 1.7\\
    $Y$                 & 280            & 260 & 250\\    \hline
    \multicolumn{4}{c}{${\rm Physical~quantities}$} \\
    \hline
    $r_{\rm in}$ (AU)     & 22             & 27 & 32\\
    $r_{\rm out}$ (AU)    & 6100           & 6900 & 8000 \\
    r($T_{\rm dust}=100$ K) (AU) & 76	   & 85 & \\
    n($T_{\rm dust}=100$ K) (cm$^{-3}$) & $2\times10^{8}$ & $3\times10^{8}$ & \\
    $M_{\rm env}$ ($M_\odot$) & 1.9         & 2.1 & 5.4 \\
 \hline
  \end{tabular}
  \tablefoot{The upper 
    half of the table lists the best-fit model parameters, the lower half reports 
    some relevant physical quantities. The last column reports the results 
    of the \citet{Sch02} analysis for comparison. }
 \end{table}