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Figure 4


Fig. 4. Example force curves for the stick insect (A,B) and the dock beetle (C,D). A and C show proximal slides (resulting in a positive friction force); B and D show distal slides (resulting in a negative friction force), preceded by a short proximal movement. Dark grey background denotes proximal, light grey background denotes distal movements. Sliding velocity 500 µ ms–1, each slide followed by a 5 s pause before pull-off.