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Fig. 1.
Location of the mask adopted for our observations at LBT plotted on the B-band image (NOAO). The mask (in cyan) was centered at RAJ2000 = 17h56m59s, DecJ2000 = 65°18′42″ with a rotation angle with respect to north of 45°. This mask allowed us to observe the central part of the protocluster, including the radio galaxy.
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