\begin{table}%t4
%\centering
\par
\caption{Results of ensemble of identical clumps, {  Ensemble case~1}. The mass and FUV field for each single clump are listed in Cols.~(2) and~(3); Cols.~(4)--(6) present the line intensity
ratios between the ensemble models and observations of $^{12}$CO 4--3, $^{12}$CO 1--0 and $^{13}$CO 1--0; the C, CO and H$_{2}$ column densities from the ensembles are presented in Cols.~(7)--(9); Col.~(10) is the C/CO ratios. The total number of the clumps in the ensemble and ensemble mass are listed in Cols.~(11) and~(12); Col.~(13) lists the beam filling factor of each clump. The total ensemble mass $M_{\rm ens}$ listed in the table is computed as $M_{\rm ens} = N_{\rm ens} \times M_{\rm cl}$, where $M_{\rm cl}$ is the mass of a clump.}\label{models}
\begin{tabular}{lcrcccrrrcrcc}
\hline\hline 
Position            & $M_{\rm cl}$  & $\chi_{\rm en1}$  & $R_{\rm ^{12}CO 4-3}$ & $R_{\rm ^{12}CO 1-0}$ & $R_{\rm ^{13}CO 1-0}$ & $N$(C)$_{\rm ens}$ & $N$(CO)$_{\rm ens}$ & $N$(H$_{2}$)$_{\rm ens}$ & C/CO$_{\rm ens}$ & $N_{\rm ens}$ & $M_{\rm ens}$ & $\eta_{\rm bf,i}$ \\
& $M_{\odot}$  &  &  & & & 10$^{16}$[cm$^{-2}$]  & 10$^{17}$[cm$^{-2}$]   & 10$^{21}$[cm$^{-2}$]        &  &  & $M_{\odot}$      &                    \\
\hline
Northern rim        & 0.32             &  10                 & 0.63                     & 0.67                     & 0.87                     & 13.97                 & 18.58                  &  7.72                       & 0.075               &  4.59            &  1.47             &  0.17              \\
Cluster             & 0.10             & 100                 & 1.07                     & 0.99                     & 1.13                     & 10.02                 & 21.56                  &  8.90                       & 0.046               & 16.75            &  1.68             &  0.04              \\
Ridge               & 0.32             &  32                 & 0.95                     & 1.13                     & 0.95                     &  8.90                 & 29.49                  & 11.29                       & 0.030               &  6.72            &  2.15             &  0.08              \\
Map center          & 0.10             &  32                 & 0.94                     & 1.05                     & 0.97                     & 13.25                 & 34.24                  & 13.05                       & 0.039               & 24.56            &  2.46             &  0.04              \\
$[\ion{C}{i}]$ peak & 0.10             &  32                 & 0.94                     & 1.59                     & 0.83                     & 31.54                 & 29.88                  & 13.14                       & 0.106               & 24.74            &  2.47             &  0.08              \\
Western rim         & 0.10             &  10                 & 0.78                     & 1.43                     & 0.71                     & 24.52                 &  9.33                  &  6.10                       & 0.263               & 11.51            &  1.15             &  0.17              \\
Southern rim        & 0.32             &   1                 & 0.84                     & 0.81                     & 0.74                     & 14.62                 &  6.28                  &  3.03                       & 0.233               &  5.70            &  1.82             &  0.17              \\
\hline  
\end{tabular}
\end{table}