Table 4: Characteristics of the galaxy number overdensities. Column 1: quasar name. Column 2: limit for the galaxy catalog (said to be as complete as the FDF galaxy catalog where the curves in Fig. 1-top join). Column 3: magnitude range over which we can study the significance of the galaxy overdensity. Column 4: position of the center of the galaxy number overdensity relative to quasar image A (see Figs. 3 and 4). The uncertainty of the exact position of the galaxy overdensity is about 5 $^{\prime \prime }$ . Column 5: galaxy density at the location of the galaxy overdensity center. Column 6: FDF mean galaxy density in the magnitude range given in Col. 3. Column 7: FDF maximal galaxy density in the same magnitude range. Column 8: detection level (in $\sigma$ ) of the cluster compared to the FDF mean galaxy density level. Column 9: detection level of the cluster (in the magnitude range given in parentheses) above the galaxy background level measured in the same frame.
Compl. Mag Galaxy overdensity Density FDF FDF Above Above

limit range location mean max FDF background

$\Delta \alpha$ , $\Delta\delta$ gal/( $^\prime$ )² density density density mean

CTQ 414 25.2 $24\leq R <25$ -10 $^{\prime \prime }$ , -05 $^{\prime \prime }$ 29.0 14.4 25.0 2.6 $\sigma$ 4 $\sigma$ ( $24\leq R <25$ )

HE 0230-2130 24.5 $24\leq R <24.5$ +40 $^{\prime \prime }$ , -05 $^{\prime \prime }$ 7.7 5.4 14.8 1.1 $\sigma$ 2.5 $\sigma$ ( $24\leq R <25$ )

LBQS 1009-0252 24.0 $23\leq R<24$ +60 $^{\prime \prime }$ , +40 $^{\prime \prime }$ 10.8 5.2 10.0 2.8 $\sigma$ 3.5 $\sigma$ ( $23\leq R<25$ )

B 1030+074 24.0 $21 \leq R <23$ -90 $^{\prime \prime }$ , -70 $^{\prime \prime }$ 11.0 3.2 7.0 5.6 $\sigma$ 4.5 $\sigma$ ( $21 \leq R <23$ )

HE 1104-1805 23.3 $23\leq R <23.3$ 00 $^{\prime \prime }$ , +50 $^{\prime \prime }$ 9.0 1.2 2.0 26 $\sigma$ 4 $\sigma$ ( $23\leq R<24$ )

B 1359+154 24.3 $22\leq R <23$ -08 $^{\prime \prime }$ , +03 $^{\prime \prime }$ 4.6 2.2 6.0 3.0 $\sigma$ 5 $\sigma$ ( $22\leq R <23$ )

H 1413+117 25.0 $23\leq R<25$ -10 $^{\prime \prime }$ , -10 $^{\prime \prime }$ 38.3 19.7 32.5 2.3 $\sigma$ 5 $\sigma$ ( $23\leq R<25$ )

HE 2149-2745 24.0 $23\leq R<24$ +08 $^{\prime \prime }$ , +07 $^{\prime \prime }$ 10.6 5.2 10.0 2.6 $\sigma$ 6 $\sigma$ ( $23\leq R<25$ )

**Table 4:** Characteristics of the galaxy number overdensities. Column 1: quasar name. Column 2: limit for the galaxy catalog (said to be as complete as the FDF galaxy catalog where the curves in Fig. 1-top join). Column 3: magnitude range over which we can study the significance of the galaxy overdensity. Column 4: position of the center of the galaxy number overdensity relative to quasar image A (see Figs. 3 and 4). The uncertainty of the exact position of the galaxy overdensity is about 5 $^{\prime \prime }$ . Column 5: galaxy density at the location of the galaxy overdensity center. Column 6: FDF mean galaxy density in the magnitude range given in Col. 3. Column 7: FDF maximal galaxy density in the same magnitude range. Column 8: detection level (in $\sigma$ ) of the cluster compared to the FDF mean galaxy density level. Column 9: detection level of the cluster (in the magnitude range given in parentheses) above the galaxy background level measured in the same frame.
	Compl.	Mag	Galaxy overdensity	Density	FDF	FDF	Above	Above
	limit	range	location		mean	max	FDF	background
			$\Delta \alpha$ , $\Delta\delta$	gal/( $^\prime$ )²	density	density	density	mean
CTQ 414	25.2	$24\leq R <25$	-10 $^{\prime \prime }$ , -05 $^{\prime \prime }$	29.0	14.4	25.0	2.6 $\sigma$	4 $\sigma$ ( $24\leq R <25$ )
HE 0230-2130	24.5	$24\leq R <24.5$	+40 $^{\prime \prime }$ , -05 $^{\prime \prime }$	7.7	5.4	14.8	1.1 $\sigma$	2.5 $\sigma$ ( $24\leq R <25$ )
LBQS 1009-0252	24.0	$23\leq R<24$	+60 $^{\prime \prime }$ , +40 $^{\prime \prime }$	10.8	5.2	10.0	2.8 $\sigma$	3.5 $\sigma$ ( $23\leq R<25$ )
B 1030+074	24.0	$21 \leq R <23$	-90 $^{\prime \prime }$ , -70 $^{\prime \prime }$	11.0	3.2	7.0	5.6 $\sigma$	4.5 $\sigma$ ( $21 \leq R <23$ )
HE 1104-1805	23.3	$23\leq R <23.3$	00 $^{\prime \prime }$ , +50 $^{\prime \prime }$	9.0	1.2	2.0	26 $\sigma$	4 $\sigma$ ( $23\leq R<24$ )
B 1359+154	24.3	$22\leq R <23$	-08 $^{\prime \prime }$ , +03 $^{\prime \prime }$	4.6	2.2	6.0	3.0 $\sigma$	5 $\sigma$ ( $22\leq R <23$ )
H 1413+117	25.0	$23\leq R<25$	-10 $^{\prime \prime }$ , -10 $^{\prime \prime }$	38.3	19.7	32.5	2.3 $\sigma$	5 $\sigma$ ( $23\leq R<25$ )
HE 2149-2745	24.0	$23\leq R<24$	+08 $^{\prime \prime }$ , +07 $^{\prime \prime }$	10.6	5.2	10.0	2.6 $\sigma$	6 $\sigma$ ( $23\leq R<25$ )

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