Growth rates for the linear instability in an inviscid fluid with thermal stratification θ = 2.0 and low Mach number of the order of 10-2. In a) and c) the Péclet number is equal to unity and in b) and d) Pe = 0.1. Ri is varied at the two bottom plots c) and d) but it is fixed to Ri = 0.22 for the top plots a) and b).
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