Fig. 7.
Ratios of the power spectra of solar brightness variations for Kepler as shown in Fig. 6. Blue lines represent the ratios of 57° to 90° and orange lines between 0° and 90°. Panel a: cycle 19 and panel b: cycle 22. The vertical dashed black line indicates the synodic solar rotation period at 27.3 days. The horizontal solid black line indicates a ratio of 1.
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