Upper panel: velocity distributions of the galaxies in the western and eastern samples (thick/red and thin/black lines, respectively). The velocity distribution of a subsample of the eastern sample, i.e. the 27 galaxies within a radius of 1.5′from the E peak (E1.5 sample), is also shown (black thick line). Lower panel: the galaxy density distribution in the velocity space, as provided by the DEDICA adaptive-kernel reconstruction method for the E1.5 sample (solid line) and for two samples contained within a larger and a smaller radius, E2.0 and E1.0 samples (dashed and dotted lines, respectively). Units on the y-axis are normalized to the density of the highest peak.