Decl.‐R.A. plot for all galaxies in our A3128/A3125 sample with redshifts in the range ﹩9000< cz< 29,000﹩ km s⁻¹, with galaxies in the more restricted range ﹩16,000< cz< 19,500﹩ km s⁻¹ marked as filled squares. The positions are given in arcminutes from the center of A3128 (﹩\alpha =3^{\mathrm{h}\,}30^{\mathrm{m}\,}43\fs 8﹩, ﹩\delta =-52^{\circ }31^{\prime }30^{\prime \prime }﹩, J2000.0). The two bright X‐ray peaks are denoted as six‐pointed stars.