Background fit of the star KIC 12008916, as derived by Diamonds. The original PSD is shown in gray, while a smoothed version with boxcar width set to Δν/ 5, with Δν taken from Mosser et al. (2012c; see also Table 1), is shown as a black line to guide the eye. The red thick line represents the background model without the Gaussian envelope and computed with the values listed in Table A.1. The green dotted line accounts for the additional Gaussian component using the values listed in Table A.2. The individual components of the background model as given by Eq. (1) are shown by blue dot-dashed lines.