Fig. 2
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Simplified periodograms for the second moon, obtained as a χ2 difference between the observed epochs Ei and computed epochs E(t) for constant mean periods P2 (green line), and linearly variable periods P2(t) = P2(0) + Ṗ2t (black line). The value Ṗ2 = 1.8 × 10−8 d d−1 corresponds to the offset of λ2 in Fig. 1. The grey box in the upper panel shows a range of the bottom panel.
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