\begin{table}%t5
%\centering
\par
\caption{Results of ensembles with a clump mass distribution and mass-size distribution, {  Ensemble case 2}. Column (2)--(4) present the ratios (in erg~s$^{-1}$~sr$^{-1}$~cm$^{-2}$) of the
modelled and observed line intensities for $^{12}$CO 4--3, $^{12}$CO 1--0 and $^{13}$CO 1--0; The mean clump ensemble density $n_{\rm mean}$ and the fitted FUV field $\chi_{\rm en2}$ are
presented in Cols.~(5) and~(6). 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 masses are listed in Col.~(11); Col.~(12) is the minimum reduced $\chi^{2}$ of the fit.}\label{ensemble2}  
\small 
\begin{tabular}{lccccrrrrccr} 
\hline\hline \noalign{\smallskip} 
Position  & $R_{\rm ^{12}CO 4-3}$ & $R_{\rm ^{12}CO 1-0}$ & $R_{\rm ^{13}CO 1-0}$ & $n_{\rm mean}$   &$\chi_{\rm en2}$& $N$(C)$_{\rm ens}$ & $N$(CO)$_{\rm ens}$ & $N$(H$_{2}$)$_{\rm ens}$ & C/CO$_{\rm ens}$ & $M_{\rm ens}$ & $\chi^{2}_{\min}$ \\
                     &                          &                          &                          & [10$^{5}$~cm$^{-3}$] &                   & 10$^{16}$[cm$^{-2}$]  & 10$^{17}$[cm$^{-2}$]   & 10$^{21}$[cm$^{-2}$]        &                     & $M_{\odot}$      &                  \\
\hline        %inser
Northern rim         & 1.00                     & 1.04                     & 1.44                     & 3.2                &   3                & 14.36                 & 51.82                  & 19.28                       & 0.028               & 3.84             &  1.43            \\
Cluster              & 1.06                     & 1.03                     & 1.13                     & 3.2                & 100                &  9.88                 & 25.58                  &  9.93                       & 0.039               & 1.97             &  0.23            \\
Ridge                & 1.13                     & 1.26                     & 0.91                     & 3.2                &  32                &  9.05                 & 23.43                  &  9.10                       & 0.039               & 1.83             &  0.50            \\
Map center           & 1.08                     & 1.19                     & 1.08                     & 3.2                &  10                & 13.78                 & 40.71                  & 15.39                       & 0.034               & 3.07             &  0.29            \\
$[\ion{C}{i}]$ peak  & 1.13                     & 1.73                     & 0.86                     & 1.0                &  10                & 31.24                 & 40.16                  & 16.61                       & 0.078               & 2.88             &  2.37            \\
Western rim          & 1.83                     & 2.03                     & 1.13                     & 1.0                &  10                & 30.49                 & 23.72                  & 12.61                       & 0.078               & 2.19             &  3.37            \\
Southern rim         & 1.06                     & 0.84                     & 0.66                     & 0.3                &   1                & 13.58                 &  5.24                  &  2.62                       & 0.259               & 0.53             &  4.91            \\
\hline  
\end{tabular}
\end{table}