Table 2: Results of the LTE analysis. The excitation temperature $T_{\rm ex}$ is listed in Col. (2); Col. (3)-(5) present C, CO and H2 column densities; the C/CO ratio is listed in Col. (6). The uncertainties of the column densities are derived by varying the integrated intensities by $\pm $15%.
Number $T_{\rm ex}$ N(C) $_{\rm LTE}$ N(CO) $_{\rm LTE}$ N(H2) $_{\rm LTE}$ C/CO $_{\rm LTE}$
  K 1016[cm-2] 1017[cm-2] 1021[cm-2]  
Northern rim $\rm 18^{47}_{15}$ $\rm 12.08^{19.71}_{9.27}$ $\rm 9.56^{22.84}_{7.16}$ $\rm 12.50^{28.55}_{8.95}$ $\rm0.13^{0.28}_{0.04}$
Cluster 5020 $\rm 9.61^{11.17}_{7.77}$ $\rm 16.99^{19.54}_{7.33}$ $\rm 21.24^{24.43}_{9.16}$ $\rm0.06^{0.15}_{0.04}$
Ridge 5028 $\rm 9.04^{10.46}_{7.32}$ $\rm 19.37^{23.03}_{10.43}$ $\rm 24.21^{28.78}_{13.04}$ $\rm0.05^{0.10}_{0.03}$
Map center $\rm 48^{50}_{18}$ $\rm 13.09^{16.00}_{10.68}$ $\rm 24.39^{29.03}_{10.25}$ $\rm 30.49^{36.29}_{12.82}$ $\rm0.05^{0.16}_{0.04}$
$[C {\sc i}]$ peak 5029 $\rm 26.85^{30.88}_{21.71}$ $\rm 44.47^{51.14}_{24.56}$ $\rm 55.59^{63.93}_{30.70}$ $\rm0.06^{0.13}_{0.04}$
Western rim $\rm 28^{50}_{15}$ $\rm 19.72^{28.30}_{17.61}$ $\rm 16.25^{29.99}_{9.52}$ $\rm 20.31^{37.49}_{11.90}$ $\rm0.12^{0.30}_{0.06}$
Southern rim $\rm 7^{8}_{6}$ $\rm 37.50^{72.57}_{21.96}$ $\rm 6.66^{8.54}_{5.40}$ $\rm 8.32^{10.67}_{6.76}$ $\rm0.56^{1.34}_{0.26}$


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