Fig. 5

Top: discrete Fourier transform window function of the Q06−Q17 data set. Bottom panels: complete and resolved ℓ = 1 triplets in the Fourier transform of the Q06−Q17 data set. The prewhitened FT is overdrawn (green); for the central mode in the lowest panel no prewhitening was attempted prompted by the amplitude-variable nature of this triplet. The red horizontal line marks the 4.5σ limit. The triplet spacings are 0.12−0.14 μHz.
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