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Dispersion relations ω=ω(k) for the uncoupled (a), longitudinal (b) and transverse (c) waves of the relaxed micromorphic model with free micro-inertia η= 10−2 kg m−1. TRO, transverse rotational optic; TSO, transverse shear optic; TCVO, transverse constant-volume optic; LA, longitudinal acoustic; LO1/LO2, first and second longitudinal optic; TA, transverse acoustic; TO1/TO2, first and second transverse optic.
