Fitting the Hapke model to the average reflectance in a box of 3 × 3 pixels centered on the location of the green star in Fig. 1, with α > 0.05° and ι, ϵ< 70°. The inset zooms in on the phase angle range below 1°. These four solutions, with parameters listed in Table 2, were identified by the Levenberg–Marquardt optimization algorithm. Panels A and B use the single-term Henyey–Greenstein function, whereas Panels C and D use the double-term Henyey–Greenstein function. The search start value for the photometric roughness was for panels A and C, whereas it was for panels Band D.