**Table 2:** Parameters of the comparison radio galaxy sample of Willott et al. (2002): Spectral indices, $\alpha$ $_{\rm cm}$ , fitted to the total cm wavelengh data with an accuracy of about 5%. Via $F_\nu \propto \nu ^{\alpha }$ the 850 $\mu$ m synchrotron fluxes are extrapolated from the cm fluxes with a formal uncertainty of about 30-40%.
Object	z	$\alpha$ $_{\rm cm}$	$F^{\rm syn}_{\rm 850~\mu m}$ [mJy]
4C 13.66	1.450	-1.24	1.84
3C 239	1.781	-1.22	1.71
3C 241	1.617	-1.45	0.73
3C 294	1.786	-1.30	0.96
3C 322	1.681	-1.35	1.44
3C 437	1.480	-1.45^a	3.05
3C 470	1.653	-1.45	1.30
6C 0820+3642	1.860	-1.17	0.37
6C 0901+3551	1.904	-1.15	0.43
6C 0905+3955	1.882	-1.42	0.09
6C 0919+3806	1.650	-1.10	0.62
6C 1204+3708	1.779	-1.10	1.24

^a Actually $\alpha$ $_{\rm cm}$ refers to $\alpha$ $_{\rm cm-850~\mu m}$ , due to the low 850 $\mu$ m upper limit.

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