Table 4: Results of PDR model calculations for ensembles of clumps having same mass and density. $\phi _{\rm A}$ is the area filling factor of the clumps.
( $n_{\rm cl}$,  $\chi$) N(H2) $_{\rm ens}$ $M_{\rm ens}$ $M_{\rm cl}$ $N_{\rm ens}$ C/CO $_{\rm ens}$ $\Phi_{\rm A}$
(cm-3, $\ast$) cm-2 $M_{\rm\odot }$ $M_{\rm\odot }$      
  $4.0\times10^{21}$ 2.9 0.001 2859 0.43 3.3
  $7.0\times0^{21}$ 5.0 0.01 500 0.22 2.7
(105, 102) $1.2\times10^{22}$ 8.6 0.1 86 0.11 2.2
  $2.3~\times10^{22}$ 16.4 1.0 16 0.06 1.9
  $4.0\times10^{22}$ 28.6 10 3 0.03 1.6
  $2.0\times10^{21}$ 1.4 0.001 1429 1.14 1.7
  $6.0\times10^{21}$ 4.3 0.01 429 0.22 2.3
(105, 103) $1.1\times10^{22}$ 7.9 0.1 79 0.13 2.0
  $1.9\times10^{22}$ 13.6 1.0 14 0.07 1.6
  $3.7\times10^{22}$ 26.4 10 3 0.04 1.6
  $3.0\times10^{21}$ 2.1 0.1 21 0.9 2.4
(104, 103) $6.0\times10^{21}$ 4.3 1.0 4 0.4 2.2
  $9.0\times10^{21}$ 6.4 10 1 0.3 2.5

$\ast$ In Draine units.


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