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So I recommend the author to make a cross-wavelet with a new time
series of sunspots number when one atributes opposite signals to even (positive)
and odd (negative) solar cycles.

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The 22 yr solar cycle is usually not seen in sunspot number, but it can be identified when one attributes opposite signals to even (positive) and odd (negative) solar cycles (Hoyt and Schatten, 1997). After making this change in sunspot number time series, a new sunspot number time series is obtained that makes possible to detect the 22-yr cycle (Rz 22 yr).

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