Fig. 8.
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Detectability of the solar cycle in the average VIRGO travel times. (A) Cycle amplitude 
versus number of skips Nskip used in the average. The colored area outlines the uncertainty 
(Eq. (30)). (B) S/N of the 11 yr cycle as a function of Nskip. The data analyzed here were divided into segments of T = 90 days in length with a sampling time of 90 days.
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