Top: Total energy vs. duration of all identified features. A power-law fit is attempted for the data points that have durations more than 50 s. Those data points correspond to 0.2% of the total number of events (3083 out of 145 306). The power-law index is α = 2.55 ± 0.05. Bottom: Same as in top panel for mean volume vs. duration. The power-law index is α = 0.56 ± 0.01.
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