Left: Distribution of distance from the in situ ICL particles to the main branch progenitor centre at the formation time of the particle, in units of the main branch halo radius R₂₀₀. Green is for GADGET-X, magenta for GIZMO-SIMBA. Right: Distance from the in situ particles to the centre of the closest halo (or subhalo), in units of the radius of that halo, R_subhalo. To ease comparison, we still show the distance to the main branch with the corresponding solid lines. The lines show the median computed stacking the 324 clusters; the shaded regions are the 16th–84th percentiles.