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Fig. 9

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Time-averaged phase speed of the fast mode at selected fixed geometrical heights (top panel) and selected optical depth levels τ1 = 1, τ2 = 0.025, τ3 = 0.001, τ4 = 0.0001, and τ5 = 2.5 × 10-5 (bottom panel). The bold lines indicate the regime where cA/cs > 1, while the thin lines represent the regime where cA/cs < 1. The asterisks mark the locations where the respective height levels cross the equipartition level.

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