Fig. 12

Top: variation in pulse spatial width (Δr) with distance for the 2007 May 19 event. Bottom: variation in pulse temporal width (Δτ) with time. Panels contain data from STEREO-A (left) and STEREO-B (right). Pulse spatial width here refers to the FWHM of the fitted Gaussian pulse (i.e., ). The dashed line in all panels indicates the best linear fit to the data. More cases are displayed in Figs. 13 to 15.
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