Table 7: Upper limits to the observed ionising flux illuminating clouds with no associated radio emission. The predicted ionising fluxes are calculated from the spectral type and projected distance of the ionising stars contained in Table 6.
Source ID $\lambda$ 3 $\sigma$ flux upper limit Cloud radius Max. observed ionising flux Predicted ionising flux

(cm) $S_{\rm max}$ (mJy) R (pc) $\Phi_{\rm max}$ (10⁶ cm^-2 s^-1) $\Phi_{\rm P}$ (10⁶ cm^-2 s^-1)

SFO 45 20 5.16 0.30 24 38

SFO 46 13 0.75 0.05 18 13

SFO 48 20 2.58 0.01 20 15

SFO 50 20 3.60 0.05 21 41

SFO 51 20 2.82 0.15 19 69

SFO 52 20 9.45 0.20 78 8.6

SFO 53 20 9.60 0.10 84 9.0

SFO 54 20 5.10 0.21 36 0.6

SFO 55 20 1.50 0.48 11 23

SFO 60 20 360.00 0.12 2900 2500

SFO 71 13 4.10 0.61 140 0.06

SFO 72 20 10.80 0.54 92 820

SFO 73 13 3.00 0.27 100 190

SFO 80 20 30.00 0.28 220 230

SFO 81 13 6.90 0.19 190 270

SFO 86 13 3.00 0.36 56 1600

SFO 87 20 126.00 0.43 500 1300

SFO 88 20 78.00 0.40 300 990

**Table 7:** Upper limits to the observed ionising flux illuminating clouds with no associated radio emission. The predicted ionising fluxes are calculated from the spectral type and projected distance of the ionising stars contained in Table 6.
Source ID	$\lambda$	3 $\sigma$ flux upper limit	Cloud radius	Max. observed ionising flux	Predicted ionising flux
	(cm)	$S_{\rm max}$ (mJy)	R (pc)	$\Phi_{\rm max}$ (10⁶ cm^-2 s^-1)	$\Phi_{\rm P}$ (10⁶ cm^-2 s^-1)
SFO 45	20	5.16	0.30	24	38
SFO 46	13	0.75	0.05	18	13
SFO 48	20	2.58	0.01	20	15
SFO 50	20	3.60	0.05	21	41
SFO 51	20	2.82	0.15	19	69
SFO 52	20	9.45	0.20	78	8.6
SFO 53	20	9.60	0.10	84	9.0
SFO 54	20	5.10	0.21	36	0.6
SFO 55	20	1.50	0.48	11	23
SFO 60	20	360.00	0.12	2900	2500
SFO 71	13	4.10	0.61	140	0.06
SFO 72	20	10.80	0.54	92	820
SFO 73	13	3.00	0.27	100	190
SFO 80	20	30.00	0.28	220	230
SFO 81	13	6.90	0.19	190	270
SFO 86	13	3.00	0.36	56	1600
SFO 87	20	126.00	0.43	500	1300
SFO 88	20	78.00	0.40	300	990

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