Fig. 4
Top. Smoothed power spectrum using a boxcar filter over 0.5 μHz (grey) and 2 μHz (black) between 3000 μHz and 3470 μHz. Superimposed is the best fit for HD 176465 A (red) and HD 176465 B (blue). Middle. Residual power spectrum of HD 176465 B, obtained by dividing the original spectrum with the best fit of HD 176465 A. Bottom. Residual power spectrum obtained by dividing the original spectrum with the best fit for HD 176465 A and B. Data points between the lower and higher red-dashed lines have 95% probability to be due to noise for the black power spectrum.
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