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Fig. 3

image

Degree of circular polarisation of the J-burst components (F1, F2 and H2) as observed by the Nançay Decamteric Array (NDA; Boischot et al. 1980). Top panel: NDA dynamic spectrum of the degree of circular polarisation of the J-burst. Bottom panel: frequency slices from the top panel averaged over 20 frequency bins to produce the average degree of polarisation over frequency ranges that sample F2, F1, and H2, respectively.

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