Fig. 5
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Top: highest > 25 MeV-proton peak intensity observed (black dots) in each event as a function of time, with widespread events marked in red. Daily and monthly sunspot numbers are shown by gray curves (right axis) provided by WDC-SILSO, Royal Observatory of Belgium, Brussels. Bottom: histogram of event occurrences, with all events in gray, widespread events in red, and narrow-spread events in blue.
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