Erosion (in m) at the surface of 67P over one revolution, calculated with Model 1 assuming pure water ice (f =1 in Eq. (1)). Two scales are shown for the colour bar: one corresponding to our model with pure water ice (model scale) and one corresponding to the same model but scaled to the total mass loss derived from RSI data and OSIRIS images (realistic scale). The results were obtained with Model 1.