Redshift histogram of the sample S1 around z ~ 0.1. The dotted blue vertical lines refer to the borders of the final clipping, while the actual members of the sample S2 are shown as a dark shaded region. The redshift of galaxy group LCLG −42 230 is indicated by a black and red vertical line, based on our sample S2 and previous work of Tucker et al. (2000), respectively. The definition of S1 and S2 are given in Sect. 6; the corresponding data are listed in Appendix A.