Spatial distribution of the spectroscopic redshifts. The ten members of the structure at z = 2.02 are shown by filled circles (for high-quality redshifts) and open circles (for quality “B” z_spec). The other sources with an assigned spectroscopic redshifts are shown by crosses for low-redshift (z_spec < 1) galaxies and open squares for high-redshift (z_spec > 1.5) galaxies. Proper distances of 1 and 2 Mpc (at z = 2.020) from the radio galaxy are shown by the dotted lines. The density contours from Fig. 2 are also included.