Density ratio to the mean density of the galaxy density distribution in superstructures (red) and in regions around clusters outside superstructures (blue) as a function of the limiting radius. The solid lines show the results for the total survey volume and the dashed lines the ratio for this volume without the Zone of Avoidance. The radii for which the values are listed in Table 2 are marked with solid points. The green lines show the density ratio to the mean density of the regions outside the superstructures (solid line) and outside the cluster halos of the non-member clusters (dashed lines).