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Fig. 17
Top and middle: spectrum of gravity waves for ℓ = 1,2,3 as function of frequency and period. Bottom: Fourier transform of the middle spectrum that shows the constant period spacing between peaks. We find ΔP1 = 37.1 min, ΔP2 = 21.2 min, and ΔP3 = 14.8 min as pointed out by vertical red dotted lines.
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