Projected phase space for our groups. Top panel: NGC 5098 group projected phase space (R, v_pec) centred on NGC 5098a. The blue points correspond to galaxies belonging to subgroup 1 and the red points to subgroup 2. The dominant galaxies are marked by yellow halos. The grey lines are the caustic lines for the subgroup 1 distribution, whereas the green dashed lines are its best-fit NFW profile, allowing for estimates of M₂₀₀ and R₂₀₀ (see text). The dashed vertical line shows R₂₀₀. We note the compact group of galaxies around NGC 5096 at $(R,v_{\mathrm{pec}})\approx (0.1h_{70}^{-1}$Mpc, 1000 km s⁻¹). Bottom panel: projected phase space centred on the NGC 5096 group (subgroup 2).