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The Hallstatt oscillation. We show three curves: from thickest to thinner: the international; sunspot number, the Schove (1955, 1961) and Usoskin et al.’s (2003) time series, all scaled to fit. The right-hand abscissa corresponds with the historical and Schove time series and the left-hand abscissa is that of Usoskin et al. (2003).