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Difference of apparent proton release time (as obtained from VDA) and the time derivative maximum of the soft X-ray intensity as a function of VDA apparent path length s for the catalogued events. The red symbols represent solar cycle 23 (1996–2008) events, and the blue symbols represent solar cycle 24 (2009–2016) events. The lower equations refer to the linear fit for solar cycle 23 events, the upper ones to the linear fit for solar cycle 24 events. One event, for which s > 13 AU, is not shown here.
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