Results for the full perturbation analysis of Sect. 4 (solid lines) compared to the results of the simplified perturbation analysis of Sect. 3 (dashed lines). Here case 2 is shown (φg = −φd) with φd = −1. For the rest the figure is the same as Fig. 3. If we would have plotted case 1 instead of case 2, the difference would only be that the curves would not be cut off for St ≲ 10-4, but would continue down to St → 0 in the same fashion as the dashed lines in Fig. 3.
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