Successive GLS periodograms of the HD 20794 time series, where the main signal is subtracted at each step by adding one more planet in the multi-Keplerian model from top to bottom, starting from the GLS of the raw data and following with the residuals to the one-Keplerian and the two-Keplerian fit. Eccentricities have been set to zero. False-alarm probability thresholds of 10% and 1% are indicated. The lowest GLS periodogram of the residuals to the three-Keplerian model shows only the 10% FAP level.
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