Table 3: Lower limit magnitude of detectability of a putative lensing galaxy according to its position (Cols. 2, 3 and 4). Column 5 displays the minimal redshift for an $\mathcal{L}^*$ galaxy of this magnitude.
Position R J Ks

(a) 0.8 $^{\prime \prime }$ East to A 25.5 24.0 22.5 z>1.9

(b) 0.4 $^{\prime \prime }$ West to B 26.5 24.5 24.5 z>3.2

(c) 7.0 $^{\prime \prime }$ South-West to A 27.0 24.5 24.5 z>4.5

**Table 3:** Lower limit magnitude of detectability of a putative lensing galaxy according to its position (Cols. 2, 3 and 4). Column 5 displays the minimal redshift for an $\mathcal{L}^*$ galaxy of this magnitude.
Position	R	J	Ks
(a) 0.8 $^{\prime \prime }$ East to A	25.5	24.0	22.5	z>1.9
(b) 0.4 $^{\prime \prime }$ West to B	26.5	24.5	24.5	z>3.2
(c) 7.0 $^{\prime \prime }$ South-West to A	27.0	24.5	24.5	z>4.5

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