Pooled results for the first 6 stars. Find plots for the remaining 21 stars in Fig. D.1. Blue symbols denote FEROS data and green symbols HARPS data. The lines show the best fits for the different numbers of sinusoidal signals fitted: dotted: zero signal (constant), dash-dotted: one signal, dashed: two signals, dash-dot-dotted: three signals. The solid line replaces the line which qualified as best fit using the F-test described in Sect. 3.4. The dotted vertical lines represent the periods of the identified signals and the number in the bottom right corner the number of identified signals. The model parameters are shown in Table 2. We note that σ_p and not is shown.