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Fig. 7.

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PSD of the radial velocity as a function of frequency for the four simulations ref (top left), boost1d1 (top right), boost1d2 (bottom left), and boost1d4 (bottom right) at different depths. The vertical grey line indicates the convective frequency for each simulation. The spectra are obtained via mode projection on the spherical harmonics basis and a temporal Fourier transform of the radial velocity.

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