Crater size-frequency distributions. The crater SFDs at Chang’e-5 and 6 are from Jia et al. (2020) and Yue et al. (2024), respectively. Error bars (1σ uncertainty) are given according to Poisson statistics. The density of the Chang’e-6 unit is less than that of the Chang’e-5 unit by a factor of at least 1.0345 (the smallest difference occurs at a diameter of 0.25 km), except for the small number statistics at 1.4 km in diameter.