Bright deposit NP07. (a) Color composite with (R, G, B) = (F5, F2, F8). (b) F2 image (low compression ratio) with the contrast enhanced in shadowed areas, revealing the bright deposit. (c) F7 image (high compression ratio) with the contrast enhanced in shadowed areas, revealing compression artifacts. (d) F2 image in b with the sampled areas outlined. Outline colors correspond to the curves in e. (e) Spectra associated with the areas indicated in d. Data points with a symbol are derived from images with a low compression ratio and are therefore more reliable. Top: bright material spectra, background spectra, and and their difference Bottom: bright material and background spectra divided by the background spectrum. The projections in a–d show the area bounded by latitudes (76.5°, 78.5°) and longitudes (351.0°, 359.0°)E.