Figure 1
An overview of a series of dart leaders along the track of the positive leader on flash 19A-1 that are of interest for this work. The sub figures show successive time periods, sub figure (a) shows the beginning of the flash to t=90 ms, sub figure (b) the following period until t=190 ms while sub figure (c) shows the later part up to t=600 ms when the last dart leaders passes through the section of interest, where its track was used to mark the positive leaders track. The gray circles indicate the track of the inferred positive leader that is investigated in this work where on the left the numbering is given as used later in this work. The \(\bigotimes \) mark indicates the initiation of the flash.
