\begin{table}%t4
%\centering
\par
\caption{Parameters of the best-fitting dusty model. In the acceptable
range, we give an indication of the range of values that, while
producing a worse fit, still correspond to a model reproducing the
data within the photometric uncertainties.\label{tab:param}}
\begin{tabular}{lll}
\hline\hline
Parameter & Value & Acceptable range \\
\hline
$t_{\rm sb}$    & 1~Myr             & 1--2 Myr \\
$T_{\rm in}$    & 570~K             & 550--650~K \\
$X_{\rm Si}$    & 0                  & $<$$10$ \\
$X_{\rm Gr}$    & 0.84               & 0.8--0.9 \\
$a_{\rm min}$   & 0.005~\mic\       & $<$$0.01$~\mic \\
$a_{\rm max}$   & 0.5~\mic\         & 0.4--0.6~\mic\ \\
$q$         & $2.5$              & $2.5$--$3.0$ \\
$r_{\rm lim}$   & 2.8~pc            & 2.8--7~pc \\
$\beta_{1}$ & 0                  & 0--0.5 \\
$\beta_{2}$ & 0.5                & 0--0.5 \\
$\tau_{\rm V}$  & 7                  & 7--8 \\
\hline
\end{tabular}
\end{table}