Fig. 7.
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Solar-cycle evolution of four parameters in the integral fluence spectrum in Eq. (3), as shown by the left y-axes. The uncertainty of each parameter results from assuming a 5% uncertainty in the SEPEM dataset as mentioned in Sect. 3.1. Solid dots are parameters of GLE events. The black lines in the background represent the daily sunspot number as scaled by the right y-axes.
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