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Fig. 9. Dependence of the adhesion force on load. (A) Data of all points on three
pitchers. Different symbols correspond to different pitchers. (B,C) Values
measured on the same point (selected examples) with increasing applied force.
In six out of eight cases, the adhesion increased significantly linearly with
the applied force (B), while it remained constant for the other two cases (C).
Fa, adhesion force; Fn, applied
force.