Mean mass densities of 492 satellite galaxies (circles) as a function of distance to their hosting TNG50 Fornax-type cluster, with colours indicating their stellar masses (colour bar). The cluster has a virial mass and radius of M_vir = 7.6 × 10¹³ M_⊙ and R_vir​ = ​1075 kpc, respectively, and corresponds to a snapshot at redshift z​ = ​0. Its tidal field radial profile (|τ|) is shown in all panels (purple curve). Shown as a function of cluster-centric distance from the top to bottom panels are: the dynamical mass densities of each satellite ${\overline{\rho }}_{2h}$ (top), measured within 2h; the central mean dynamical mass densities ${\overline{\rho }}_{2h\star }$ within 2h⋆ (middle), and the central stellar mass densities ${\overline{\rho }}_{2h\star }^{\star }$ within 2h⋆ (bottom). The blue curves in each plot show the moving average (Mov. Av.) of different mass densities for all the satellites using Eq. (17). The measurement of the transition radius (ℜ_⋆ metric [ii]) is shown with a vertical dot-dashed line (middle and bottom panels). Histograms are shown in the right column sub-panels to show the shape of the mean mass density distributions.