Rise-to-decay time ratios obtained from 307 light curves with frequencies ranging from 60 to 1725 kHz. (a) Ratios (and associated uncertainties) of rise-to-decay times with respect to frequency. The rise and decay times were calculated at the S_max/e level using Eq. (2). The dashed black line represents the weighted linear fit to the data, with the obtained relation stated at the bottom of the panel. The dotted black line indicates the level at which the ratio is equal to 0.5. (b) Histogram of the calculated rise-to-decay time ratios. The median value is ∼0.54 (and the average value is ∼0.56).