Adaptive kernel for the Cen A subgroup members. Shown is the density distribution of satellite galaxies along the CaZ axis from a superposition of projected standard normal curves accounting for distance uncertainties (see text). The black line corresponds to the T15 sample (members and candidates), and the red dotted line to the Candidate sample, assuming a distance of 3.68 Mpc (Cen A) and an uncertainty due to the depth of the subgroup of ±0.5 Mpc. The standard normal curves of the candidates are shown in gray.