CaSSIS RGB (RED = RED, G = PAN, B = BLU) colour composite with latitude–longitude grids of Phobos (A) and Deimos (B), RED/PAN (C,D), PAN/BLU (E,F), PAN/NIR (G,H) for Phobos (cube 296, left) and Deimos (cube 229, right). The band ratios have been normalised with the same factor, i.e. the mean of Phobos’ band ratio. The normalisation factors are 1.1327 for RED/PAN, 1.0899 for PAN/BLU, and 0.8683 for PAN/NIR.