Fig. 4

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Growth rate of the acoustic resonant drag instability as a function of the dust-to-gas ratio μ, calculated numerically from Eq. (26). The dimensionless wavenumber K = 1, and the size density is constant between smin = 0.875 and smax = 1.05. The green dotted line indicates the monodisperse result (46), while the orange dotted line indicates the polydisperse limit (55).
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