Table 6: Parameters of the "best'' PDR models.
Henize 2-10 NGC 253

n(H) (cm^-3) $8.0\pm 1\times 10^{5}$ $3.0\pm 0.5 \times 10^{5}$

$\chi$ (on each side) 20 000 20 000^a

v^b (km s^-1) 60 187

FF $1.5\pm 0.5\times 10^{-3}$ $9.7\pm 4\times 10^{-2}$

^a Carral et al. (1994) found for NGC 253 a FUV flux of $2\times 10^{4}~G_{0}$ in units of Habing (1968) corresponding to $1.2\times 10^{4}~G_{0}$ in units of Draine (1978); compatible with our value.
^b Deduced from Gaussian fits to line profiles.

**Table 6:** Parameters of the "best'' PDR models.
	Henize 2-10	NGC 253
n(H) (cm^-3)	$8.0\pm 1\times 10^{5}$	$3.0\pm 0.5 \times 10^{5}$
$\chi$ (on each side)	20 000	20 000^a
v^b (km s^-1)	60	187
FF	$1.5\pm 0.5\times 10^{-3}$	$9.7\pm 4\times 10^{-2}$

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