(A) The global total reflectance at 121.6 nm (Lyα) wavelength from the LRO/LAMP instrument. (B) Total latitudinal average of 121.6 nm reflectance with a standard deviation envelope. (C) Only the mare regions of the global reflectance at 121.6 nm wavelength. (D) Maria reflectance latitudinal average with a standard deviation envelope. (E) Only the highland regions of the global reflectance at 121.6 nm wavelength. (F) Highlands reflectance latitudinal average with a standard deviation envelope. Horizontal dashed lines mark ±55° latitude.