Fig. 1
GLS periodograms of the RV data for HD 180617. Upper three panels: individual instruments, followed by the combined data set. Lowermost panel: periodogram of the residuals of the best-fit solution. The horizontal lines (dotted, dash-dotted, and dashed) illustrate FAP levels of 10, 1, and 0.1%. The best-fit period at Pb = 105.9 d is highlighted by the vertical red line.
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