Top panel: comparison of our values with the pEW_Hα values from Jeffers et al. (2018). Colours denote spectral types. Middle panel: normalised Hα luminosity of active stars as a function of spectral type (red crosses). The blue circles indicate our activity threshold of Å, and the numbers reflect the number of stars below this threshold. Bottom panel: fraction of Hα active stars per spectral subtype for the 331 stars of our sample with error bars from binomial statistics. Numbers reflect the total number of sample stars in the corresponding bin.