Locations of D17+YL19 giant sample in the HRD. Symbols: gray dots: D17+YL19 giant sample; big red dots: flaring giants verified in the present paper; small red dots: contaminating dwarfs and stars with unknown evolutionary status. Light blue crosses mark the oscillating giant stars from Gaulme et al. (2020) for stars brighter than Kpmag = 12.5 which coincide with the stars in our D17+YL19 sample overlapping them on the figure. The orange star marks the location of the Sun. See the text and Fig. B.1 for more details.