Indication of thinning of the dust cover close to honeycomb ASH01. Smooth dust cover over the rim of a boulder-filled depression present on November 11, 2014 (a) had become more clear-cut by March 28, 2015 (indicated by the red arrow in (b)). Some boulders in the depression had become more distinguishable. The earlier observation was taken at the phase angle of 70◦ with the pixel resolution of 0.52 m. The later observation was taken at a similar phase angle of 68◦ with the pixel resolution of 0.51 m (Table A.1).
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