Fig. 4.
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Dependence of annual KSO DR parameters A and B and the WDC-SILSO relative sunspot number as an indicator of solar activity. Straight lines represent least-squares fits through the set of data points derived by the DS method for individual years. Parts a and b cover all KSO measurements 1964–2016. Statistical results for each least-squares fit are available in Table 2, rows 6 and 10.
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