Fig. 14

Estimates of ε1 (red), ε2 (blue) and εgrain of Mare Imbrium for a 35–40°N and b 40–45°N. εgrain = 6.60 (for 35–40°N) and 6.56 (for 40–45°N) are values representative of this region, while ε1s are latitudinal averages. The vertical error bars for ε1 and ε2 show 95% confidence intervals, while horizontal error bars denote their spatial extent