FFDs grouped by different spectral type and giants. In the panel of each spectral type (panels a–e), the counts of the corresponding samples are given in parentheses, and the numbers of flaring stars and flare events are connected by the short line. We drew the relationships of the sample that have removed eclipsing binary stars by blue lines, and shifted them upward by two orders of magnitude. For the results of K- and M-type stars (panels d and e), we also plot the corresponding dwarf samples with orange lines, which are shifted downward by two orders of magnitude. Panel f shows giants; we put the counts of flaring stars in brackets. The results of subgiants and red giants were shifted up and down by two orders of magnitude, respectively.