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Dynamics of pile form. Temporal dynamics of the ratio length (in direction of the air current) over width of the piles (mean±s.e.), without air currents (filled rectangles, n=22), with air currents (open circles, n=29 piles) and in the control experiment with lowered acrylic glass (open grey triangles, n=8). The grey line indicates the expected ratio of 1 for circular piles.
