Map of the 2MASS galaxy distribution smoothed with a Gaussian of σ = 4 degrees. The density ratio to the average density is shown by six contour levels: 0–0.23 (black), 0.23–0.62 (dark blue), 0.62–1.13 (light blue), 1.13–1.9 (grey), 1.9–3.7 (olive), and > 3.7 (white). The clusters of the five superstructures are overplotted with filled black circles. The member clusters of two superclusters in region A and one supercluster in region B (as labelled in Fig. 9) are shown with open circles. Two clusters extending into the target redshift range from the Coma supercluster at lower redshift are marked by open squares.