Fig. B.1.

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Eigenvalues of Eqs. (B.1) & (B.2) for unstable modes with η′ = 1 over z ∈ [0,1], satisfying the conditions described in Sect. 5.4, and under different compression rates −∂zVz relative to the fundamental mode frequency ω0 obtained at Vz = 0; blue (resp. red) crosses represent the real (resp. imaginary) part of the eigenvalue.
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