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The gross contact area of the finger pad, Ag, as a function of the compressive displacement for orientations of the finger pad of 30° (blue diamonds) and 45° (red circles). The full line (blue) and dashed line (red) are the best straight line fits to equation (4.1) for 30° and 45° orientations, respectively, and used to obtain corresponding values for the mean finger pad radius of curvature, Rg. (Online version in colour.)
