Average activity level (measured as the pEW′(Hα) of the serval template, in linear scale between −0.1 and 0.1, and logarithmic scale otherwise) as a function of the stellar mass of the 98 selected stars. The data points are colour-coded with the target rotation period P_rot (grey points indicate targets with unknown P_rot), and their size is given by the number of CARMENES VIS observations (with all the stars with more than 150 observationshaving the same size). We have indicated the name of several stars for reference. All values compiled from Table A.1.