Differences found in richness estimates. Left panel: comparison within richness calculated in two different absolute magnitude cuts: group regime (M_r < −19.5), for structures with z < 0.3, and cluster regime (M_r < −21.25), within 0.3 < z < 0.8. Right panel: PZWav S/N in the function of the derived richness. Some groups overlooked in the cluster regime can have a significant richness in shallower magnitude cuts.