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Fig. 8

image

Top and middle panels: Lomb-Scargle periodogram of two synthetic light curves whose modulation is produced by two spots rotating with equal velocity and in anti-phase. In the first example (red) both spots are on the northern hemisphere, while in the second panel (blue) the spots are on opposite hemispheres. The black line corresponds to the reference case of one spot at L1 = 40°. Bottom: comparison between the peak-height ratios recovered from the top and middle panels (red and blue, respectively) and the reference ratios for i = 70° (black).

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