Fig. 3.
Measured S index against the international sunspot number (WDC-SILSO) on approximately the same day. The red line represents the best fit between them, as presented in Eq.(9). The gray lines are the bisector regression fitting of 105 Monte Carlo simulations based on the activity dispersion in each sunspot number bin. The numbers placed on the top of each error bar represent the number observations that were considered to estimate its mean and dispersion.
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