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Fig. 1

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Location of the galaxies belonging to Group1 (z ~ 1.42) and Group2 (z ~ 1.44) in the B-band image (NOAO). Galaxies of Group1 are represented by red circles, while those of Group2 by blue triangles. The central radio galaxy 7C 1756+6520 is the red star and belongs to Group1. North is at the top and east to the left. The field of view is ~500′′ × 200′′ centred on the radio galaxy. 1′′ corresponds to ~8.4 kpc.

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