Power spectrum of KIC 9574283 (smoothed over a 10 μHz boxcar) computed with 650 days of Kepler data (gray curve). Two Harvey-type laws (solid black lines) had to be considered to reproduce the shape of the background. The fitted background is represented by the dashed blue line, while the long-dashed red line shows the background that is obtained with only one Harvey profile. The dotted line shows the contribution from the photon noise.