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Apparent significance of the results of the Yeung [27] analysis, as a function of the percentile value used to assess the cutoff in sunspot number, SSN. The result of Yeung [27] was obtained with an SSN percentile cutoff of 60% (0·6), which resulted in almost maximal apparent significance. Note that the Group sunspot numbers do not yield a significant result for any percentile used to assess the cutoff in SSN.
