Fig. 1.
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(a) The sample correlation function R(d) for d = 0, …, 29 between sunspot group areas from the entire data set. (b) The sample correlation function R(d) for d = 0, …, d* (dashed line) and the best fitting for the Model I (solid line). (c) The same as for (b), but for the Model II. (d) The same as for (b), but for the Model III.
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