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The histograms of number of sunspot groups creating one cluster in the northern (filled triangles) and the southern hemispheres (open circles) for (a) cycle 12, (b) cycle 13, (c) cycle 14. (d–f) The same as in the upper row, but for cycles 15–17. (g–i) The same as in the upper row, but for cycles 18–20. (j–l) The same as in the upper row, but for cycles 21–23.
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