Left: time series of RVs, CCF FWHM, CCF bisector span, I_{Ca II}, I_{H α}, and I_{Na I} for HARPS (blue) and ESPRESSO (green). The vertical scales are the same in both broken panels. For the RVs, FWHM, and BIS span an offset between the two instruments was adjusted and subtracted. The average values before this offset are shown in the panels. Middle: Bayesian Lomb-Scargle periodograms of the HARPS and ESPRESSO observations. The red lines indicate the periods of 13.3 and 25.6 days. Right: correlation of each activity indicator with the RVs, showing Pearson’s correlation coefficient individually for the two instruments.