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Total GLE fluence averaged over the years 1956–2012 (in black), exponent-over-rigidity solar proton fluence spectrum averaged over 1954–2008 (Reedy, 2012, in orange), compared with spectra at 30% confidence (in blue) and 90% confidence (in red) simulated with model 2 for a mission of 37 years during solar active time and 20 years during solar quiet time.
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