Left: Stellar mass of the central BCG within 100 kpc versus the total halo mass M_200c for the four simulations, scaled to a common h. Magneticum is plotted in blue, IllustrisTNG in purple, Hydrangea in orange and Horizon-AGN in gold. Center: Same stellar mass plotted against the halo mass as given by M_500c. Also plotted are observations by DeMaio et al. (2018) and Kravtsov et al. (2018). Right: Total stellar mass (BCG, ICL and satellites) against M_500c for the simulations, as well as observations by Andreon (2012), Laganá et al. (2013), Gonzalez et al. (2013), Budzynski et al. (2014), Kravtsov et al. (2018), Sartoris et al. (2020).