Table 12: Ratio of the PRONAOS to ISOPHOT average brightnesses on extended sources. The average value is weighted using 1/ $\sigma ^2$ .
Source PRONAOS/ISOPHOT

$\rho$ -Ophiuchi 1.25 $\pm$ 0.13

M 42-1 0.98 $\pm$ 0.07

M 42-2 $1.01\pm0.07$

Average $1.04\pm0.07$

**Table 12:** Ratio of the PRONAOS to ISOPHOT average brightnesses on extended sources. The average value is weighted using 1/ $\sigma ^2$ .
Source	PRONAOS/ISOPHOT
$\rho$ -Ophiuchi	1.25 $\pm$ 0.13
M 42-1	0.98 $\pm$ 0.07
M 42-2	$1.01\pm0.07$
Average	$1.04\pm0.07$

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