Locations of selected facets, identified through clustering analysis of illumination curves, are marked on the 67P/C-G comet 2D map from El-Maarry et al. (2016). In this representation, facets labeled “R” indicate regions where removal activity occurs in the global simulation of the dust layer removal model for 67P/C-G, whereas those labeled “NR” correspond to regions where no removal activity is observed in the simulation.