Top panel: Ca II K chromospheric index (black dots) vs. the time in JD on the lower axis and in years on the top axis. The continuous red line is obtained by smoothing the data with a time window of 60 days. The vertical dotted and dashed lines indicate the time intervals during which measurements of the RV of the Sun as a star were acquired by Haywood et al. (2016) and Dumusque et al. (2015), respectively. Lower panel: same as the upper panel, but for the total magnetic flux as measured by SOLIS VSM.