a) Indication of each burst detected in the algorithm using the Hough transform. The forward drift bursts are highlighted in orange-red and reverse drift are in green-blue. In general, the forward drift were more difficult to detect due to their weaker signal to noise and because they drift into an area of high RFI <20 MHz. This is the reason why there are more reverse drift detections than forward drift. b) Zoom of the second set of reverse drifting bursts with detections overlaid as circles.