Two-dimensional histograms showing the distribution of the events that build the ICL_post. The top row is for GADGET-X, the bottom row for GIZMO-SIMBA. The first column shows the scatter plot between infall redshift and mass ratio to the host cluster, coloured by the number of accreted halos. The second and third columns show the total mass that each halo contributed to the ICL_post of the involved cluster, as a function of infall redshift and mass ratio of the event. The Spearman correlation coefficients, r_s, are shown in each panel.