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α factors from Table 3 plotted versus the Δacf/Δt (E > 90 keV) multiplied by the mean ap index in each period. α < 1 are removed when calculating the best fit in the regression. The equations for the best fit lines are presented in Eq. (2). A 95% prediction interval for the regressions is plotted in dashed blue lines. The standard deviations of α are plotted as vertical lines.
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