RV analysis for HIP 18606. Top panel: RV time series for data taken with UCLES (blue circles), FEROS (red tilted triangles), and the pre- and post-pandemic Chiron data (orange and green triangles, respectively) for HIP 18606. The best-fit Keplerian model is represented by the black curve. Lower panel: RVs phase folded to the period of the detected planet candidate. The symbols represent the same data; however, the points are coloured depending on their observing date (see colour bar at right). The pink contours around the best-fit Keplerian model in black delimit the 1,2, and 3σ spread taken from the Markov chains. Both plots refer to the overall most probable model, the fixed eccentricity model with a white noise model component only.