Dressler-Shectman plot of our spectroscopic sample S0. Symbol size scales with above a threshold of δ_i = 3, below that value galaxies are shown as simple dots, and the sample S2 is emphasized by larger green dots. Filled triangles and the filled star symbolize the central regions of galaxy groups and one galaxy cluster found in the vicinity of our survey field, as listed in the NED. The colour of each symbol corresponds to the redshift of the respective source.