Top: correlation between measured F8 values and RV jitter amplitude of our targets (filled circles) and the stars from Bastien et al. (2014; crosses). At the top left are presented the calculated value of ρ and also its posterior distribution for our targets (green histogram and green value) and for the full sample (blue histogram and blue value). The RV jitter values reported in Bastien et al. (2014) with values less than 4 m s^-1 are considered as the upper limits, and are indicated by descending arrows in this plot. The points are color-coded according to their T_eff. Bottom: same as the top, but for the F8 and photometric variation amplitude.