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Fig. 2

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Time evolution of the runs in Table 2. Upper panel: mean squared values of velocity and generated magnetic field components Bx, Bz of run B128c (Pr = PrM = 1) scaled by and respectively. Note the clear exponential growth until t ≈ 1.4tA0. Fast oscillations in ⟨ U2 ⟩ until ttA0 indicate g-modes originating from the initial velocity perturbation. Middle panel: mean squared values of generated magnetic field components for different runs. For legend see lower panel. Lower panel: rms value of By. Prandtl numbers indicated as (Pr, PrM).

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