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Maximum shear stress of smooth pads of cockroaches (N. cinerea) on microstructured and smooth substrates. The shear stress was smallest on the two densest tall (1.4 μm high) pillar arrays where pads made partial contact. Centre lines and boxes represent the median within the 25th and 75th percentiles, whiskers show the 10th and 90th percentiles and circles indicate outliers. fc, full contact; pc, partial contact. Scale bar, 100 μm.
