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The upper row: (a) the histograms of number of sunspot groups creating one cluster for the ascending phases of solar cycles in the northern (filled triangles) and the southern hemispheres (open circles). (b) The fit of a regression line (solid line) with the 95% confidence bands (dashed lines) to the histogram points for the ascending phases of solar cycles in the northern hemisphere (filled triangles), but in the log-linear scaled plot. The correlation coefficient and the regression equation are given in the left lower corner. (c) The same as in (b), but for the histogram points from the southern hemisphere (open circles). The middle row: the same as in the upper row, but for the maximum phases of solar cycles. The lower row: the same as in the upper row, but for the descending phases of solar cycles.
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