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Fig. 3
Top: L-S periodogram of all IHα measurements after removing the contribution of all frequencies (f1, f3–f5 in Table 1) except that associated with GL 581d (f2). bottom: L-S periodogram of the IHα measurements taken between JD = 2 455 200 and 2 455 645 after removing the contribution of f6 in Table 1.
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