Fig. 3
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Growth rate for the backward propagating sound wave, with ω0 = −kcg, for μ = 0.001, smin = 0.5 and smax = 1.2. The solid blue curve represents the exact solution to Eq. (26), while the orange curve is the approximation (31) for μ ≪ 1, which overlaps with the blue curve everywhere except for K ≲ μ. The dotted line is the approximation (32) for small K.
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