Table 1: Properties of the KOSMA- $\tau$ PDR-model clumps with given masses and densities at an incident FUV-flux of 10² $\ensuremath {\chi _{\rm D}}$ . Orders of magnitude are given in parentheses.
Densities Mass Column densities Temperatures

Surface Center Clump average

$\log(n\ensuremath{_{\rm\rm s}} /\ensuremath{{\rm cm}^{-3}} )$ $\log(n\ensuremath{_{\rm\rm c}} /\ensuremath{{\rm cm}^{-3}} )$ $\log(M\ensuremath{_{\rm\rm cl}} /\ensuremath{{M}_{\rm\odot}} )$ $\left< N_{\ensuremath{\element{H}_2} } \right>$ $\left< N_{\element{CO}} \right>$ $\left< T_{\ensuremath{\element{H}_2} } \right>$ $\left< T_{\element{CO}} \right>$

3.5 4.55 3.0 1.41(22) 1.71(18) 21.7 12.3

4.0 5.05 1.5 9.74(21) 1.50(18) 23.8 11.0

4.5 5.55 0.0 6.69(21) 1.07(18) 26.5 12.5

5.0 6.05 -1.5 4.57(21) 7.21(17) 29.6 15.5

5.5 6.55 -3.0 3.12(21) 4.94(17) 32.8 19.9

**Table 1:** Properties of the KOSMA- $\tau$ PDR-model clumps with given masses and densities at an incident FUV-flux of 10² $\ensuremath {\chi _{\rm D}}$ . Orders of magnitude are given in parentheses.
Densities	Mass	Column densities	Temperatures
Surface	Center		Clump average
$\log(n\ensuremath{_{\rm\rm s}} /\ensuremath{{\rm cm}^{-3}} )$	$\log(n\ensuremath{_{\rm\rm c}} /\ensuremath{{\rm cm}^{-3}} )$	$\log(M\ensuremath{_{\rm\rm cl}} /\ensuremath{{M}_{\rm\odot}} )$	$\left< N_{\ensuremath{\element{H}_2} } \right>$	$\left< N_{\element{CO}} \right>$	$\left< T_{\ensuremath{\element{H}_2} } \right>$	$\left< T_{\element{CO}} \right>$
3.5	4.55	3.0	1.41(22)	1.71(18)	21.7	12.3
4.0	5.05	1.5	9.74(21)	1.50(18)	23.8	11.0
4.5	5.55	0.0	6.69(21)	1.07(18)	26.5	12.5
5.0	6.05	-1.5	4.57(21)	7.21(17)	29.6	15.5
5.5	6.55	-3.0	3.12(21)	4.94(17)	32.8	19.9

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