Deimos spectro-photometry using the four filters of the HRSC. Each ROI has a size of 2 pixels by 2 pixels. The red and purple ROIs (ROI 1 and ROI 5) correspond to the equatorial ridge. The green ROI 2 was chosen because it corresponds to the darkest region of the surface as visible in the HRSC images. The two other ROIs are representative of the average surface. The bottom left panel presents the spectra associated with each of the ROIs. The black spectrum is derived from the disk-integrated analysis using aperture photometry. The bottom right panel corresponds to the spectra for each ROI, normalized at the green filter central wavelength (i.e., 535 nm). We note that the red and IR radiance factors are lower than expected for Deimos; this is linked to an absolute calibration factor problem with these filters (McCord et al. 2007).