Fig. 5.
Average umbral power spectra of the LOS velocities obtained with the Ca I 10 839 Å (violet), Si I 10 827 Å (green), Fe I 5435 Å (orange), and He I 10 830 Å (blue) lines. The power of the three former lines is normalized to the maximum power of the Si I 10 827 Å line, while the He I 10 830 Å is normalized to its maximum power.
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