Table 3: KOSMA- $\tau$ calculations of H₂, C and CO column densities of spherical clumps with n=10⁵ cm^-3 and $\chi = 10^2$ (Draine units). The column densities are for individual clumps, and not the column densities observed per beam.
$M_{\rm cl}$ N(H₂) $_{\rm cl}$ N(C) $_{\rm cl}$ N(CO) $_{\rm cl}$ $\frac{N(\rm {C^0})}{N(\rm {CO})}_{\rm cl}$ $R_{\rm cl}$

10²¹ 10¹⁶ 10¹⁷

$M_{\rm\odot }$ cm^-2 cm^-2 cm^-2 pc

10 31 23 79 0.03 0.077

1 14 20 32 0.06 0.036

0.1 6.6 14 13 0.11 0.017

0.01 3.3 8.7 4.0 0.22 0.008

0.001 1.3 4.2 1.0 0.43 0.004

**Table 3:** KOSMA- $\tau$ calculations of H₂, C and CO column densities of spherical clumps with n=10⁵ cm^-3 and $\chi = 10^2$ (Draine units). The column densities are for individual clumps, and not the column densities observed per beam.
$M_{\rm cl}$	N(H₂) $_{\rm cl}$	N(C) $_{\rm cl}$	N(CO) $_{\rm cl}$	$\frac{N(\rm {C^0})}{N(\rm {CO})}_{\rm cl}$	$R_{\rm cl}$
	10²¹	10¹⁶	10¹⁷
$M_{\rm\odot }$	cm^-2	cm^-2	cm^-2		pc
10	31	23	79	0.03	0.077
1	14	20	32	0.06	0.036
0.1	6.6	14	13	0.11	0.017
0.01	3.3	8.7	4.0	0.22	0.008
0.001	1.3	4.2	1.0	0.43	0.004

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