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Fig. 2.

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Evolution of perturbations in radial velocity δvr (top three rows), magnitude of the outgoing Elsässer variable δz+ (middle three rows), and magnitude of the incoming (towards the Sun) Elsässer variable δz (bottom three rows). For each quantity, the results for the flux tube expansions, fmax = 3, 5, and 10, are shown in the left, middle, and right columns, respectively. The frequency of the injected pump wave is indicated in the inset of each panel.

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