Erosion efficiency with respect to the cumulative mass of the projectiles. Because the projectiles are coming in from random directions, this time a larger cake with a base area of 150 × 150 μm and a height of ≈70  μm is used. Each data point depicts the average erosion efficiency after shooting in a bunch of 100 monomers. The random distribution of impact angles greatly reduces the passivation effect. At the end of the simulations roughly a quarter of the aggregate mass has been eroded.