Top: distribution of burst recurrence times below 6 h. The black line shows the distribution of single bursts in our sample with a peak value around 2.3 h. Secondary bursts in SWT doublets are represented by the solid blue histograms. Recurrence times around 4 h and above are due to gaps in the observations. Bottom: distribution of e-folding exponential decay times. The black line shows the distribution of single bursts in our sample. The data suggest a maximum in the distribution at around 15 s. Secondary bursts in SWT doublets are represented by the solid blue histogram.
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