Data (black points) versus best-fit model (red continuous line) as a function of the orbital phase of KELT-1b. From top to bottom: full data set; same data, but with the best-fit primary transit, PT(t), removed; ellipsoidal variation, EV(t), removed; Doppler beaming and stellar activity, DB(t) and SA(t), respectively, removed, at which point the secondary eclipse and the phase curve are visible; residuals, once the secondary eclipse and the phase curve are removed. The last two panels are shown at a 0.02 orbital phase binning. The last four panels are given in ppm.