Fig. 13.
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Parameter a describing the amplitude of the directivity, for the model described by Eq. (5), and determined by a fit of this model to the peak fluxes for the five radio bursts selected, shown as coloured crosses. Previous results obtained in statistical studies of flux ratios of type III radio bursts by Bonnin et al. (2008) and Hoang et al. (1997) are also shown as squared boxes.
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