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Fig. 5.


Upper panel: échelle diagram of a slightly smoothed version of the power spectrum. The ridges from the p-modes with different l-value are clearly visible, as are the alias peaks from the window function. Lower panel: collapsed échelle diagram with labels centred above the peaks marking the l{0, 1, 2, 3} ridges and the ±1 and ±3 daily aliases (no secondary alias present).

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