M- and K-type stars (using the SDSS spectral type classification) with their respective distances and G magnitudes from Gaia DR2. Flaring stars are shown within the plot. Example for a dwarf star (Proxima Centauri), an M0-type star (GJ 270), and a Sun-like star are given. The diameter of the Milky Way is given as an upper constraint on the distance. Errors in the distance are color-coded. Green shows error smaller than 5%. Olive shows an error between 5 and 20%. Brown shows an error between 20 and 50%. Black shows an error higher than 50%.