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(a) Receding and advancing contact line on micropillar array with 3.3 μm spacing. Arrow indicates direction of drop movement. Scale bar, 50 μm. For complete movie, see Supplementary Movie 2. (b) Receding contact line on micropillar array with 40 μm spacing. Arrow indicates direction of drop movement. Scale bar, 50 μm. For complete movie, see Supplementary Movie 1.
