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Dimensionless mean force ν0 〈f〉/rf as a function of the dimensionless loading rate rf/(ν0 f0). The continuous line corresponds to Eq. 6. The symbols represent the various experiments carried out in this study. Upper (resp. Lower) corresponds to the distances from tip to surface between 0 and 100 nm (resp. 100 to 200 nm), and the optimal frequency ν0 = 0.20 s−1 with Ω2 = 2.39 (resp. 0.44 s−1 with Ω2 = 3.18). The adjusted values of f0 are given in Table 1.
