Table 1: Compiled data for the different radio continuum surveys.
Survey Frequency Resol. 5- $\sigma$ $N_{\rm {CIG}}^{1}$ $N_{\rm {det}}^{1}$

(MHz) (arcmin) (mJy)

WENSS 325 & 352 $\sim$ 1 $\sim$ 18 405/278 49/37

NVSS 1420 $\sim$ 0.8 $\sim$ 2 1050/719 374/311

FIRST 1420 $\sim$ 0.08 $\sim$ 1 560/360 81/58

GB6 4850 $\sim$ 3.5 $\sim$ 18 1017/691 32/12

$^{\rm 1}$ Total number of galaxies with radio data ( $N_{\rm {CIG}}$ ) and with radio detection ( $N_{\rm {det}}$ ), followed by the number of galaxies belonging to the complete subsample of N=719 galaxies.

**Table 1:** Compiled data for the different radio continuum surveys.
Survey	Frequency	Resol.	5- $\sigma$	$N_{\rm {CIG}}^{1}$	$N_{\rm {det}}^{1}$
	(MHz)	(arcmin)	(mJy)
WENSS	325 & 352	$\sim$ 1	$\sim$ 18	405/278	49/37
NVSS	1420	$\sim$ 0.8	$\sim$ 2	1050/719	374/311
FIRST	1420	$\sim$ 0.08	$\sim$ 1	560/360	81/58
GB6	4850	$\sim$ 3.5	$\sim$ 18	1017/691	32/12

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