Results of our Voronoi tesselation analysis: Colored cells are left after filtering according to the pre-calculated source density thresholds (0.7, 0.8, and 0.9 in different colors; see Section 4.1 for details). Black dots are galaxies with the local source density higher than 80% of the density values from the total sample, and together with the hosts of radio galaxies 10913 and 44 (manually added, see the text for details) form a sample of probable group members. Host galaxies of the 7 radio sources are shown as open gray circles. 10913, 44, and 4092 correspond to the first, second, and third brightest galaxies of the group, respectively, in the SC i⁺ band (white stars).