Table 5: 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 12CO 4-3, 12CO 1-0 and 13CO 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 H2 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.

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(H2) $_{\rm ens}$ C/CO $_{\rm ens}$ $M_{\rm ens}$ $\chi^{2}_{\min}$
        [105 cm-3]   1016[cm-2] 1017[cm-2] 1021[cm-2]   $M_{\odot}$  
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
$[C {\sc i}]$ 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


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