Power spectrum of KOI-3886. The power spectrum is shown in gray (with a heavily smoothed version in black). The solid red curve indicates a fit to the background done with DIAMONDS (Corsaro & De Ridder 2014), consisting of two Harvey-like profiles (dot-dashed blue curves) plus white noise (horizontal dot-dashed yellow line). A joint fit to the oscillation power excess (dot-dashed blue Gaussian curve) and background is visible at ~ 50 μHz as a dotted green curve.