(a) HARPS RV variations of the Sun as a star. (b and c) Time series of the disc-averaged line-of-sight magnetic flux |$|\hat{B}_{\rm obs}|$| and filling factor f, respectively, determined from the SDO/HMI magnetograms. (d–f) Time series of the FWHM, BIS and |$\log (R^{\prime }_{HK})$|⁠, respectively, determined from the HARPS DRS reduction pipeline. The values of these nightly binned time series are provided in the Supplementary Files available online.