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Static contact images of the cockroach arolium (Nauphoeta cinerea) 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. fc, full contact; pc, partial contact. Scale bar, 100 μm.
