Upper: global map of Ganymede marking the locations and sizes of the 20 ROIs, as well as the coverage (locations of pixel centers) of the four reprocessed NIMS cubes investigated in this study. At the center right panel, we present a zoomed-in view of the neighboring ROIs #2 and #3. The location of the center of each ROI is marked with an × and the circle represents the corresponding size. Lower: the four reprocessed cubes at 2 μm with the locations of the pixels containing the ROIs noted in orange and the pixels used as reference for each cube in red. The outline color of each panel matches the color of the equivalent cube from the upper part of the figure. The color maps of global observations E6GNGLOBAL01 and G1GNGLOBAL01A are saturated at an I/F 0.3 and 0.35, respectively, for better contrast. (a) NIMS cube E6GNGLOBAL01A with markings of reference ROIs #1 and 2 (REF-dc: dark cratered material, REF2-l: light undivided material). (b) NIMS cube G8GNOSIRIS01A with markings of reference ROIs #3 and #4 (REF3-dc and REF4-l). (c) NIMS cube G8GNURUK01A with markings of reference ROIs #5 and #6 (REF5-lg2: intermediate light subdued material, REF6-c1: degraded crater material). (d) NIMS cube G1GNGLOBAL01A with markings of reference ROIs #7 and #8 (REF7-dc and REF8-l).