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Comparison of the F10.7-based SN proxy series with the raw Wolf numbers from the Kislovodsk solar Observatory (Russia; SILSO station ID: KS2), cover the period before and after 1980. The upper panel shows the two series, smoothed by a 12-month Gaussian kernel to reduce short-term random noise. The middle and lower panels show the ratios and differences. No data are available for that station in the blue-shaded time interval. An upward jump can been seen around 1980.
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