Table 11: Ratio of the PRONAOS to DIRBE average brightnesses on extended sources. The average value is weighted using 1/ $\sigma ^2$ .
$\lambda$ [ $~{\rm\mu m}$ ] 200 260

M 42 0.92 $\pm$ 0.06 0.96 $\pm$ 0.06

M 17 0.90 $\pm$ 0.08 0.91 $\pm$ 0.09

$\rho$ -Ophiuchi 0.97 $\pm$ 0.07 0.98 $\pm$ 0.07

CygnusB 1.03 $\pm$ 0.07 1.02 $\pm$ 0.08

Average 0.95 $\pm$ 0.07 0.97 $\pm$ 0.07

**Table 11:** Ratio of the PRONAOS to DIRBE average brightnesses on extended sources. The average value is weighted using 1/ $\sigma ^2$ .
$\lambda$ [ $~{\rm\mu m}$ ]	200	260
M 42	0.92 $\pm$ 0.06	0.96 $\pm$ 0.06
M 17	0.90 $\pm$ 0.08	0.91 $\pm$ 0.09
$\rho$ -Ophiuchi	0.97 $\pm$ 0.07	0.98 $\pm$ 0.07
CygnusB	1.03 $\pm$ 0.07	1.02 $\pm$ 0.08
Average	0.95 $\pm$ 0.07	0.97 $\pm$ 0.07

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