Decay times (top) and rise times (bottom) as a function of frequency, for 307 measurements at frequencies ranging from 60–1725 kHz, obtained from the Type III bursts listed in Table A.1. The values and their uncertainties were calculated at the S_max/e level as described in Sect. 3.1. The dashed black lines represent the weighted linear fit to the data, whose exact form is shown on the bottom left of each panel. It should be noted that the frequencies shown here (and thus reflected in the obtained relations) are given in kHz.