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Static contact images of the spatula tips of the beetle pad (Gastrophysa viridula) on squared arrays of ‘short’ pillars (1.4 µm in diameter and 0.5 µm in height), visualized by reflected-light illumination. The centre-to-centre spacing is (a) 3, (b) 4, (c) 6, (d) 8, (e) 12 and (f) 22 μm. Arrows indicate spatula tips standing on pillars in (a,b). Scale bar, 10 μm.
