Illustration of the incorrectness of the method used by ZP15 to assess the group sunspot number RG during the MM. Panel A) annual values of RG as a function of the maximum daily number of sunspot groups G∗ for the same year in the HS98 catalogue for the period of 1886–1945; the dashed line is the dependence of used by ZP15. Panel B) the overestimate factor Y of the GSN by the ZP15 method .
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