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Figure 1. Development of E1/E10 for R = 4000, α = 0.03, ε = 0.004 (dashed dotted), ε = 0.0079 (dashed) and ε = 0.008 (solid).
Figure 2. Phase-plane development of b1r versus b1i for ε = 0.008, α = 0.03, R = 4000 and 0 ⩽ t ⩽ 100 · 103.
Figure 3. (a) Numerically obtained threshold amplitudes of ε for sustained amplification versus the Reynolds number R
Figure 4. The nonlinear terms of Eq. (13c) for R = 4000, α = 0.03. (a) ε = 7.5 · 10−3, (b) ε = 7.75 · 10−3, (c) ε = 8.0 · 10−3

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