Fig. 1
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Left: trailing hemisphere of Dione colour map built with images from IR, green, and UV filters of the Cassini/ISS cameras (Schenk et al. 2011). The red perimeter encircles the region where the IR/UV ratio is at least 1.3, corresponding to a latitudinal extension of ~± 65° at longitude 270W. Right: mask of the ROI used to sort both CIRS FP1 observations and the GTM tiles.
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