a) Frequency vs. time data points for all detected bursts for both reverse (blue-green) and forward drifting bursts (orange-red). One line represents one burst, with 188 in total. b) Linear fits to each burst detection. The green-red lines originate from ~32 MHz and are detections of the first set of bursts between 10:47:30–10:50:30 UT. The blue-orange lines are the second set of bursts originating from ~43 MHz between 10:50:20–10:53:00 UT. There are not equal numbers of positive and reverse drift bursts, indicating there is not a one-to-one correspondence of particle beams travelling toward and away from the Sun, i.e. beams are bi-directional but not always in reverse and forward drift partners.