Phase distribution for the green channel of Site 7. (a) Calculated using the retrieved Hapke parameters for the green channel, inner ring of Site 7. The incidence angle i is 70°, the view zenith angle, or emission angle e is from 0° to 90°, and the relative azimuth angle ϕ is from 0° to 180°. The colors represent the RADF value as well as the z axis. (b) Observed. The red points are for the inner ring with i = 70.0°, and the blue ones are for the outer ring with i = 70.3°. (c) and (d) are the same plots as (a) and (b), but viewed from the phase angle versus reduced reflectance plane side.