Impact speed a); incidence angle b); normal speed c); crater diameter d); impact density e); and crater density f) as functions of longitude. Their variations with longitude (solid curves in red, orange, yellow, and green for v_enc = 10, 20, 30, and 40 km s^-1) and their global averages (dashed lines in the same color for the same v_enc, except for those in panel b), which are all black to represent the invariant value) are calculated with v_M = 1.0 km s^-1, d_min = 0.5 km, α_p = 1.75, ρ = 3.4 × 10^-25 km^-2, t = 3.7 Gyr, and d_c = 25 km.