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CF-11 complex shear modulus μ=μR+jμI as a function of frequency for subsurface (dipole) source study. (a) Real part. (b) Imaginary part∕ω. (○○○) experimentally derived values; (-⋅-) best fit Voigt model; (⋯) best fit α=0.6 fractional order Voigt model; (---) best fit SLS model.
