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Fig. 4.

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Measured travel times τs(ti) for all wavepackets with s ≤ 41. The red curves show the filtered data τs, smooth(ti) according to Eq. (15). The value of s is written in the top left corner of each plot. The data analyzed here are from VIRGO/SPM (red channel) divided into non-overlapping segments of T = Δt = 90 days in length (see Fig. 2).

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