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Fig. 4.
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Cumulative rate of G1, G2, and G3 storm days in the fourth years of solar cycles 17–23 plotted against the peak smoothed SSN in the same cycle. The symbol indicates the cycle number. Using the fitted lines and cumulative rates in cycle 24 suggests a peak SSN in cycle 24 of ~73 for the G1 rate, ~110 for G2, and ~95 for G3.
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