Similar to Fig. 8, 2D histogram showing the distribution of the accreted halos that build the ICL_post (top for GADGET-X; bottom for GIZMO-SIMBA). Here the colouring is weighted by the fraction of mass that each halo contributes to the total ICL_post summed across all clusters. The x-axis shows the mass ratio of the halo to the host at infall, and the y-axis shows the corresponding infall redshift.