The impact flux on the terrestrial planets as a function of NEO absolute magnitude. The black, green, blue, and red lines show the impact flux for Mercury, Venus, Earth, and Mars. The thin solid lines near the Earth flux are the base-model NEO magnitude distribution scaled with the fixed impact probability (1.5 × 10⁻³ Myr⁻¹; see the main text). The thin solid line near the Mars flux is the Earth profile scaled down by a factor of 3. The horizontal dashed line shows the impact flux for D > 1 km bodies from Morbidelli et al. (2020; 0.75 Myr average spacing between impacts). The vertical dashed line corresponds to H = 17.75.