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Fig. 1.

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Group sunspot number series by Hoyt & Schatten (1998, HoSc98, yellow), Svalgaard & Schatten (2016, SvSc16, dashed red), Chatzistergos et al. (2017, CEA17, dashed green), Usoskin et al. (2021, UEA21, cyan), and Velasco Herrera et al. (2024, VHS24, black). Shown are annual mean values.
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