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Table 2:

Characteristics of the images used to produce the foreground object's mask for each cluster field.
Cluster	Instrument and reference	Filter	Exposure time	Depth (5 $\sigma$ , AB)	Mask area $6\hbox {$^\prime $ }\times 6\hbox {$^\prime $ }$ ,	$2.2\hbox {$^\prime $ }\times 2.2\hbox {$^\prime $ }$ ,	$0.85\hbox {$^\prime $ }\times 0.85\hbox {$^\prime $ }$
Abell 1689	ISAAC/VLT Moorwood (1997)	SZ	14.4 ks	26.0	7%	12%	10%
Abell 1835	FORS/VLT Appenzeller et al. (1998)	V	19.6 ks	27.0	6%	10%	8%
AC114	SOFI/NTT Moorwood et al. (1998)	K	10.8 ks	22.0	6%	9%	7%

Notes. The three last columns representing the fractional surface area covered by the foreground galaxies in each cluster, for the three reference field of view, EMIR-like, JWST-like and NICMOS-like respectively.

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