Left: RV scatter (std RV) as a function of the average activity level (pEW′ (Hα)) of the 98 stars in the sample, colour-coded with the stellar mass. Stars with no known planetary companions are indicated with circles, while those with confirmed planetary companions are indicated with triangles. Large data points correspond to the 56 stars for which we find an activity-related signal in any of the indicators, and small data points, stars with no detection. Right: RV scatter as a function of the stellar mass of the 98 stars in the sample, colour-coded with the average activity level (pEW′ (Hα)). Same symbols and sizes as in the left panel.