Comparison of surface texture around honeycombs MAT01 and MAT02 observed on September 12, 2014 (a) and January 22, 2015 (b). Some common features are marked by yellow arrows as landmarks. The dust deposits located between MAT02 and the cliff has been partially removed, forming a distinct valley. The scale bar applies to both panels. The observation in (a) was taken at the phase angle of 72◦ with the pixel resolution of 0.51 m. b) was taken at a larger phase angle of 93◦ with the pixel resolution of 0.48 m (Table A.1). Nomenclature is as given in Table 1.