Table 1: The sample of clusters.
Name $\alpha (2000)$ $\delta (2000)$ z # frames Area (Mpc²) seeing ('')

A 2658 23 44 49 -12 17 39 0.185 1 0.3055 0.70

A 1643 12 55 54 +44 05 12 0.198 2 0.6810 0.55

A 1878 14 12 52 +29 14 28 0.220 2 0.7894 0.70

A 2111 15 39 40 +34 25 27 0.229 2 0.8030 0.70

A 1952 14 41 03 +28 37 00 0.248 2 0.7989 0.55-0.80

**Table 1:** The sample of clusters.
Name	$\alpha (2000)$	$\delta (2000)$	z	# frames	Area (Mpc²)	seeing ('')
A 2658	23	44	49	-12	17	39	0.185	1	0.3055	0.70
A 1643	12	55	54	+44	05	12	0.198	2	0.6810	0.55
A 1878	14	12	52	+29	14	28	0.220	2	0.7894	0.70
A 2111	15	39	40	+34	25	27	0.229	2	0.8030	0.70
A 1952	14	41	03	+28	37	00	0.248	2	0.7989	0.55-0.80

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