**Table 1:** Fluxes and other parameters of the quasar sample. The total submm fluxes are from Willott et al. (2002), observed between March 1999 and April 2001. Column 7 lists the thermal contribution at 1.25 mm derived from a dust model fitted to the submm data, as explained in Sect. 3.1.1 and shown in Fig. 2. Column 8 lists the synchrotron contribution at 1.25 mm, as total minus thermal contribution (Cols. 3-7) and Col. 9 lists the synchrotron fraction in percent. The spectral indices $\alpha$ $_{\rm cm-mm}$ are determined for most sources between 6 cm and 1.25 mm with an accuracy of better than 5%; more details are given in Sect. 3.1.2. These spectral indices are used to extrapolate from longer wavelength data the 450 and 850 $\mu$ m synchrotron fluxes listed in Cols. 11 and 12.
(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)	(11)	(12)
Object	z	$F_{\rm 1.25~mm}$	observ.	$F^{\rm total}_{\rm 850~\mu m}$	$F^{\rm total}_{\rm 450~\mu m}$	$F^{\rm thermal}_{\rm 1.25~mm}$	$F^{\rm syn}_{\rm 1.25~mm}$	syn	$\alpha$ $_{\rm cm-mm}$	$F^{\rm syn}_{\rm 850~\mu m}$	$F^{\rm syn}_{\rm 450~\mu m}$
		[mJy]	date	[mJy]	[mJy]	[mJy]	[mJy]	[%]		[mJy]	[mJy]
3C 181	1.382	5.96 $\pm$ 1.11	17.10.04	5.27 $\pm$ 1.06	-0.8 $\pm$ 7.5	0.66	5.30	88	-1.23	3.73
3C 191	1.952	5.36 $\pm$ 1.24	17.10.04	6.39 $\pm$ 1.06	28.9 $\pm$ 8.1	1.04	4.32	80	-1.17	3.44	1.63
3C 205	1.534			2.36 $\pm$ 1.10	11.6 $\pm$ 7.9				-1.35^b	2.24^b
3C 268.4	1.400	8.53 $\pm$ 1.56	16.10.04	5.13 $\pm$ 1.18	9.9 $\pm$ 12.5	1.11	7.42	86	-1.10	5.55
3C 270.1	1.519	11.92 $\pm$ 2.69	02.06.04	7.42 $\pm$ 1.17	15.4 $\pm$ 11.5	1.07	10.85	91	-1.11	7.76	3.83
3C 280.1	1.659	3.99 $\pm$ 1.24	16.10.04	5.10 $\pm$ 1.74	0.4 $\pm$ 23.8	<1.31^a	>2.68^a	67	-1.15	2.62
3C 298	1.439	20.68 $\pm$ 3.68	02.06.04	21.13 $\pm$ 2.06	-8.0 $\pm$ 23.7	2.12	18.56	89	-1.10	13.88
3C 318	1.574	5.61 $\pm$ 1.42	02.06.04	7.78 $\pm$ 1.00	21.6 $\pm$ 10.6	0.99	4.62	82	-1.32	3.53
3C 432	1.785	0.34 $\pm$ 1.54	29.05.04	7.93 $\pm$ 1.70	2.9 $\pm$ 20.9	2.06	<2.56	55	-1.25^b	1.60^b
4C 38.30	1.405			-0.01 $\pm$ 1.11	8.9 $\pm$ 7.8				-1.10^b	1.14^b
4C 35.23	1.594	11.93 $\pm$ 2.89	02.06.04	9.18 $\pm$ 1.10	21.3 $\pm$ 6.8	0.68	11.25	94	-0.89	8.60	4.88

^a Upper and lower limits adopted, because the thermal model is constrained by submm upper flux limits only.
^b Determined/extrapolated from the cm wavelength range only.

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