**Table 1:** Summary of data from the literature for our sample. The spectral classification is from Willott's catalog at the URL http://www-astro.physics.ox.ac.uk/~cjw/3crr/3crr.html, except (^a) for which we used the classification published in Jackson & Rawlings (1997) (spectra by Jackson & Browne 1991, for 3C 345, Tadhunter et al. 1993, for 3C 327.1 and Spinrad et al. 1985, for the rest) and (^b) for which we report the classification available in the NASA/IPAC Extragalactic Database (no references for the spectra).
Source	Redshift	$\log{L_{\rm r}}$ (5 GHz)	$\log{L_{\rm tot}}$ (178 MHz)	$\log{L_{\rm [OIII]}}$	Spectral
name	z	${\rm erg~s^{-1}~Hz^{-1}}$	${\rm erg~s^{-1}~Hz^{-1}}$	W	class.
3C 16	0.405	<30.45	34.77	-	HEG
3C 19	0.482	<33.22	35.00	-	LEG
3C 46	0.4373	31.17	34.82	36.04	HEG
3C 47	0.425	32.65	35.20	36.52	QSO
3C 99	0.426	32.99	34.81	-	HEG^b
3C 147	0.545	34.22	35.25	37.03	QSO
3C 154	0.5804	33.86	35.49	-	QSO^b
3C 172	0.5191	<31.70	35.18	-	HEG
3C 200	0.458	32.41	35.01	-	LEG
3C 215	0.411	31.96	34.80	35.83	QSO
3C 225.0B	0.58	<31.12	35.45	-	HEG?
3C 228	0.5524	32.19	35.32	-	HEG
3C 244.1	0.428	<30.56	35.13	36.27	HEG
3C 274.1	0.422	31.60	34.99	34.60	HEG(LEG^*)
3C 275	0.48	-	35.09	36.26	LEG^a
3C 275.1	0.557	33.37	35.34	35.81	QSO
3C 295	0.4614	31.71	34.79	35.23	LEG
3C 306.1	0.441	-	35.95	-	HEG^a
3C 313	0.461	<30.87	35.17	35.71	HEG^a
3C 327.1	0.4628	32.68	35.24	35.95	HEG^a
3C 330	0.55	30.93	35.51	-	HEG
3C 334	0.5551	33.12	35.11	36.61	QSO
3C 341	0.448	30.84	34.87	36.04	HEG
3C 345	0.594	34.87	35.23	36.17	QSO^a
3C 411	0.467	32.53	35.10	-	HEG^a
3C 427.1	0.572	30.57	35.53	-	LEG
3C 435A	0.471	32.12	34.95	-	Unclass
3C 455	0.543	31.19	35.19	36.31	WQ

^* 3C 274.1 is classified by Willott as a HEG, but Jackson & Rawlings classify
it as a doubtful LEG. See discussion in Sect. 5.1.

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