Panel a): distribution of PDF (gray-scale on the right) for corrected number of sunspot groups for February 1869. Panel b): PDF of the corrected G values for the day of 19-Feb.-1869 (cross-section of panel “a)” at the dashed vertical line). The composite PDF is shown by gray bars, while PDF distributions for Wolf, Schmidt, and Weber are shown as blue, red, and green lines, respectively.
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