All Tables

Table 1: The observed integrated line intensities (in erg s^-1 sr^-1 cm^-2) and line ratios at the seven selected positions. The errors on the integrated intensity are estimated to be $\sim$ 15%.
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%.
Table 3: Physical parameters at selected positions in Fig 1, obtained by fitting the observed intensity ratios to the single clump KOSMA - $\tau$ PDR models. Cols. (2)-(5) list the fitted clump densities, clump mass, clump radius and FUV field; Col. (6) is the minimum reduced $\chi ^{2}$ of the PDR fit; the FUV field derived from the FIR continuum $\chi _{\rm FIR}$ and that from the stellar radiation $\chi _{\rm star}$ are in Cols. (7) and (8); The distance to HD 281159 used for the calculation of $\chi _{\rm star}$ is listed in Col. (9).
Table 4: 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 ¹²CO 4-3, ¹²CO 1-0 and ¹³CO 1-0; 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 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.
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.