Fig. 13.
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Quasi-biennial variations in 
and ⟨δν⟩, and rms time series during solar cycles 23 and 24, normalized by their standard deviations. The data analyzed here were divided into overlapping segments of T = 365 days in length with a sampling time of 91.25 days. The three data sets were filtered in the range 1.5–3.5 yr using a Gaussian filter.
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