Variability of f2 and f3 in 2015 (top) and 2016 (bottom). Frequencies were measured in a window of 40 d stepped by 1 d. The overplotted blue dotted lines are fitted sine curves with frequency 0.0508 c/d (2015) and 0.0496 c/d (2016), tracing the respective mean fΔ32.
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