All the graphs are for HD 137388. Top panel: RVs and the activity index, log(), as a function of time. Lower left panel: RV signal of the planet, in addition to the long-period variation associated to the magnetic cycle. Lower right panel: correlation between the RV residuals (O−C) after removing the planet and the activity index. Small points correspond to all the measurements, whereas large squares represent the same data binned over three months to average out short-term activity.