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The frequency shift induced by a coupled resonance, following Equation (79). At low and high ω, the Sauerbrey limit and the elastic-load limit are recovered. The overtone scaling in these limits is −Δf/n ≈ const and +Δf·n ≈ const. In a range next to the Sauerbrey regime, the softness of the contact can be inferred from a non-trivial the overtone dependence of Δf/n + iΔΓ/n.
