Equilibrium regolith thicknesses at different latitudes. Panels a and b show the results for models with γ = 99.3^◦ and γ = 45^◦, respectively. The equilibrium thickness ranges for ordinary chondrite material are shown by the shaded red areas, and the ones for norite material by the blue. The dashed lines represent scenarios with only diurnal thermal fragmentation, with the same choice of colors for the different materials. The left and right ordinates show dimensionless and dimensional thicknesses of the regolith layer, respectively. In panel a, the black line indicates that the highest H (φ) is allowed by a cohesive strength of 0.055 Pa.