Normalised power spectral density of KIC 9163796 (top) and KIC 4586817 (bottom spectrum). The background contribution has been removed by division of the PSD through the background model. The frequency was divided by the respective large separation and centred on the central radial mode. The frequencies of the ℓ = 0 and 1 modes are marked by blue dotted and red dash-dotted vertical lines. The dotted horizontal lines mark the traditional significance threshold of 8 times the background signal.
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