Fig. 4.
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Power spectra of the radial velocity for the four stellar simulations ref, boost1d1, boost1d2, and boost1d4, respectively, in the convective zone at depth r = 0.762Rtot. The spectra were obtained via mode projection on the spherical harmonics basis and a temporal Fourier transform of the radial velocity. The radial velocities are normalised by (L/Lstar)1/3 (see text Sect. 4.1).
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