Fig. 2
Top panel: semi-logarithmic plot of the low frequency part of the 1 μHz boxcar smoothed envelope spectrum for GOLF data. The periodogram was filtered for the frequency range of strong p-modes between 1.7−3.5 mHz. Bottom panel: fit of Voigt profile (dashed red line) to the peak of the large frequency separation in the envelope spectrum with 2σ confidence intervals in grey colour.
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