Characteristics of a typical DPB with negative frequency drift. Panel a: dynamic spectrum (with approximate axial lines of the drifting components). Panel b: centroid locations of the emission sources at different times along the burst components (colors from red to violet correspond to increasing time); the times corresponding to nearby locations of the sources of different components highlight the delay between the components. The cross in the upper-right corner shows average error bars of the centroid locations (at 1σ level). Panel c: source speed (in the image plane) estimated using linear fits over 15 consecutive points.
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