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Fig. 1


Histograms of the occurrence of the difference Δlat between mean latitudes, as defined from Spörer and other observer’s data for Carrington rotations during the period of the data overlap. Panel a): Spörer vs. RGO (the mean of the distribution is −0.2°, the standard deviation σ = 2.2°). Panel b): Spörer vs. Schwabe (0.25°, σ = 3°).

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