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Static contact images of the spatula tips of the beetle pad (Gastrophysa viridula) on squared arrays of ‘tall’ pillars (1.4 µm in diameter and 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 in (a,b) indicate pillar tops touched by spatulae in partial contact. Scale bar, 10 μm.
