Table 4: Values for the 3 $\sigma$ levels, maximum possible measured ionising flux and predicted ionising flux, for radio sources not detected in the survey.
3 $\sigma$ flux upper limit Max. observed ionising flux Predicted ionising flux

SFO Object (mJy) $\Phi_{{\rm max}}$ (10⁸ cm^-2 s^-1) $\Phi_{\rm P}$ (10⁸ cm^-2 s^-1)

3 2.04 2.02 21.15

8 1.52 1.78 118.31

9 2.10 2.02 78.22

19 0.75 0.51 0.57

20 1.40 1.47 1.47

22 1.78 1.93 22.83

23 1.91 2.07 2.52

24 2.69 2.17 11.52

26 1.37 1.22 1.06

33 1.55 1.13 13.29

34 1.40 1.48 9.98

39 1.72 1.85 9.18

**Table 4:** Values for the 3 $\sigma$ levels, maximum possible measured ionising flux and predicted ionising flux, for radio sources not detected in the survey.
	3 $\sigma$ flux upper limit	Max. observed ionising flux	Predicted ionising flux
SFO Object	(mJy)	$\Phi_{{\rm max}}$ (10⁸ cm^-2 s^-1)	$\Phi_{\rm P}$ (10⁸ cm^-2 s^-1)
3	2.04	2.02	21.15
8	1.52	1.78	118.31
9	2.10	2.02	78.22
19	0.75	0.51	0.57
20	1.40	1.47	1.47
22	1.78	1.93	22.83
23	1.91	2.07	2.52
24	2.69	2.17	11.52
26	1.37	1.22	1.06
33	1.55	1.13	13.29
34	1.40	1.48	9.98
39	1.72	1.85	9.18

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