Distribution of the percentage of flares in different intervals of the duration and amplitude, respectively. For each panel, we use different colors coupled with different markers to represent different classifications and provide explanations in the legend. The durations of most flares is less than 1 h in Sample 1, while for Sample 2, the duration of most flares is less than 0.5 hour. The amplitude of most flares is less than 0.05 for both samples. For Samples 1 and 2, the distribution of flares in different duration or amplitude ranges is dominated by main sequence stars.