\begin{table}%t2
%\centering
\par
\caption {\label{param} The parameters for the two ensembles in the PDR model in IRS1.}
\scriptsize
\begin{tabular}{lclccccc }
\hline\hline
\noalign{\smallskip}
$\langle n_{\rm ens}\rangle$& $M_{\rm ens}$& $\chi$ & [$M_{\rm min},M_{\rm max}$] &{\bf $N$\tablefootmark{1}\hspace*{0.15cm} }& $f_{\rm V}$&  $ f_{A}$\tablefootmark{2} \\
(cm$^{-3}$) & ($M_\odot$) &(Draine) & ($M_\odot$) & &  &  \\
\hline
{\bf Hot:} & & & & & &  \\
$1.8\times 10^6$ &  14 & $2.3\times 10^5$ & [0.008, 7] & 151 &  0.42--0.73 &1.3 \\
{\bf Cool:} & & & & & &  \\
$1.3\times 10^6$ & 54--250 & 27 & [0.008, 27] &  413--1913 &  0.07--0.34 &  0.6--2.6 \\
\hline       
\end{tabular}  
\tablefoot {
\tablefoottext{1} {Number of all clumps;}
\tablefoottext{2} {assuming hot clumps are situated approximately 7$\arcsec$ away from IRS1;  $f_{\rm V}$ volume filling factor within a shell with $R_{\rm V,inner}=5\arcsec$ and $R_{\rm V,outer}=11$--13$\arcsec$; $f_{\rm A}$ area filling factor with $R_{\rm A}=7\arcsec$ for the hot component. For the cold component,  $R_{\rm V,inner}=11$--13$\arcsec$, $R_{\rm V,outer}=40\arcsec$, and $R_{\rm A}=40\arcsec$.}}
\end{table}