Fig. 1.
From top to bottom: dynamic spectra of two bad data segments and a type III event, their edge images detected using the Canny edge-detection method and the Hough transform results of the edge images. Left, middle, and right columns: results of a group of lightning discharges, a calibration bar, and a normal type III burst, respectively. The type III burst was observed on Apr 22, 2013, at 14:05UT.
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