Table 2: Color correction factors to be taken into account in order to transform the PRONAOS flux intensities from a (T=30 K, $\beta =2$ ) spectrum to a (T, $\beta$ ) or Rayleigh-Jeans (RJ) spectrum.
T [K] $\beta$ $\lambda _{\rm ref}$ [ $\mu$ m]

200 260 360 580

30 2 1.00 1.00 1.00 1.00

20 2 0.98 1.00 1.00 1.02

10 2 0.80 0.92 0.97 1.05

50 2 1.00 1.00 1.00 0.98

30 1 0.97 0.99 0.99 1.02

30 3 1.01 1.00 0.99 0.94

RJ 0.98 0.98 0.97 1.01

**Table 2:** Color correction factors to be taken into account in order to transform the PRONAOS flux intensities from a (T=30 K, $\beta =2$ ) spectrum to a (T, $\beta$ ) or Rayleigh-Jeans (RJ) spectrum.
T [K]	$\beta$	$\lambda _{\rm ref}$ [ $\mu$ m]
		200	260	360	580
30	2	1.00	1.00	1.00	1.00
20	2	0.98	1.00	1.00	1.02
10	2	0.80	0.92	0.97	1.05
50	2	1.00	1.00	1.00	0.98
30	1	0.97	0.99	0.99	1.02
30	3	1.01	1.00	0.99	0.94
RJ		0.98	0.98	0.97	1.01

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