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Fig. 2

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Five images analyzed in this study. The file names are (a) ST_2544540977_v, (b) ST_2544579522_v, (c) ST_2544617921_v, (d) ST_2563511720, and (e) ST_2572745988. We selected twelve large boulders (enclosed by yellow lines) for the analysis. We show enlarged images of the areas surrounded by orange squares in Fig. 6.

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