Fig. 5
Lomb-Scargle periodogram (LSP) in the 3785–3830 μHz frequency range where a weak signal is also suspected. The green (blue, red) dotted curves refer to a value equal to 4.0 (3.6, 3.0) times the local mean noise level. The indicated peak at 3805.94 μHz (f38 in Table 1) clearly emerges at 5.7 times the average noise.
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