Fig.10. Rectilinear dunes on Mars(source: NASA/JPL/UA) (a) Rectilinear dunes in Chasma Boreale (HiRISE ESP_046168_2645_RED, center point: 84.62°N, 333.79°E); (b) Early stages of the rectilinear dunes (HiRISE ESP_045100_2650_RED, center point: 84.79°N, 333.76°E); Arrows represent the wind direction of dune development
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