Iterative periodogram analysis. Left column: RV times series before any subtraction (panel a), after subtracting a one-Keplerian fit (panel d) and after subtraction of a two-Keplerian fit (panel g). Middle column: periodograms for each RV time series in the left column. Right column: RV time series shown in the left column phase-folded to the period of maximum power shown in the periodograms of the middle column. The best sine fit is superimposed. Dash-dotted (resp. dotted) lines in panels b, e, and h are placed at a power level corresponding to a false-alarm probability of 1% (resp. 0.1%).
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