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Histograms of the percentage of radio burst types II, III, IV and a combination of all three types in association to SEP events (1996–2016) over several radio wavelength bins. Black color is for visually observed bursts on dynamic radio spectra, dark-gray for uncertain identification and observatory reports and light gray for data gaps. For the burst combination, the dark-gray color denotes random combination of visual, uncertain and observatory reports.
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