Fig. 3
Illustration of the prewhitening process on the 2005 amplitude spectrum. The first panel (FT01) is the full amplitude spectrum as shown in Fig. 2. Panel FT02 shows the amplitude spectrum after subtraction of the largest amplitude peak at 2497 μHz. The next panel (FT03) shows the amplitude spectrum after additional subtraction of the next largest amplitude peak at 2221 μHz, and so on for the subsequent panels.
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