Top panel: RGB image of the Imhotep-Ash boundary on the large lobe of 67P using OSIRIS NAC close-flyby images acquired on 14 February 2015 at UTC time of 12.39. The RGB images are associated with F88 (740 nm), F82 (649 nm), and F84 (480 nm). The colored patches are the spacecraft shadow. Bottom panel: phase angle distribution calculated for each facet using the DLR SPG model SHAP4s (1M facets) and overlay on the multispectral image. The colors are assigned to a phase angle step of 0.1°. The ROIs are outlined with blue boxes and contain 4400 pixels.