\begin{table}%t3
 \caption{\label{best_fit_phy_param}Summary of the dust radiative transfer analysis of
     OMC2-FIR4.}
 %\centerline
{
 \begin{tabular}{lr}\hline\hline
   \multicolumn{2}{c}{Fixed input parameters} \\
   \hline
   \noalign{\smallskip}
   Distance, $d$	  & $437~{\rm pc}$	  \\
   Stellar temperature, $T_{\star}$    & $5000~{\rm K}$\\
   Dust temperature at $r_{{\rm i}}$, $T_{{\rm d}}(r_{{\rm i}})$   & $300~{\rm K}$\\
   Dust opacity (OH5) at 100~$\mu$m, $\kappa_{100}$ & $86.5~{\rm cm}^2~{\rm g}^{-1}$ \\
 \hline
 \noalign{\smallskip}
 \multicolumn{2}{c}{Best fit parameters} \\
 \hline
 \noalign{\smallskip}
 Luminosity, $L$   & $1000~{L}_{\sun}$\\
 Dust optical depth at 100~$\mu$m, $\tau_{100}$     & 0.6 \\
 Density power-law index, $\alpha$   & 0.6 \\
 Envelope thickness, $r_{{\rm out}}$/$r_{{\rm i}}$  & 120 \\
 \hline
 \noalign{\smallskip}
 \multicolumn{2}{c}{Physical\ quantities} \\
 \hline
 \noalign{\smallskip}
 Inner envelope radius, $r_{{\rm in}}$ 	 & $100~{\rm AU}$\\
 Outer envelope radius, $r_{{\rm out}}$ 	 & $12000~{\rm AU}$\\
 Radius at T$_{\rm dust} = 100$~K,   $r_{{\rm 100~K}}$ & $440~{\rm AU}$\\
 H$_2$ density at $r_{{\rm 100~K}}$, $n_0$ 	 & $4.3\times 10^{6}~{\rm cm}^{-3}$ \\
 Envelope mass, $M_{{\rm env}}$		 & $30~{M}_{\odot}$ \\\hline
 \end{tabular}}
 \smallskip
 The first part lists the fixed input parameters, 
     the second part reports the best-fit parameters, and some relevant 
     physical quantities corresponding to the
     best-fit model are reported in the third part.
\end{table}