**Table 5:** Spectral index values and V values for all spectra plotted in Fig. 11.
Data set	$\alpha$	V (mJy)
This work (13/5/2005)	0.77 $\pm$ 0.16	16.485 $\pm$ 0.263
This work (19/9/2005)	0.88 $\pm$ 0.05	24.370 $\pm$ 0.238
This work (4/11/2005)	1.33 $\pm$ 0.10	26.884 $\pm$ 0.489
Bertone et al. (2000)	0.42 $\pm$ 0.26	26.20 $\pm$ 0.58
Pesce et al. (1997)	0.62 $\pm$ 0.30	24.50 $\pm$ 0.67
Zhang & Xie (1996)	0.62 $\pm$ 0.16	22.90 $\pm$ 0.63
Bersanelli et al. (1992)	0.61 $\pm$ 0.38	51.88 $\pm$ 1.56 (J band)
Treves et al. (1989) (1/12/1983)	0.51 $\pm$ 0.31	19.80 $\pm$ 0.36
Treves et al. (1989) (11/11/1984)	0.51 $\pm$ 0.41	26.20 $\pm$ 0.48
Miller & McAlister (1983)	0.62 $\pm$ 0.56	17.8

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