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Fig. 2
Pre-whitening procedure on the Hα data taken between JD = 2 455 200 and 2 455 645. The original amplitude spectrum before (top) and after (bottom) removing the dominant frequency at 0.0078 d-1. The vertical dashed line marks the orbital frequency of GL 581d (ν = 0.015 d-1, P = 66.7 d).
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