Raw light curves obtained for the Spitzer/IRAC observations at 3.6 µm (left panel) and 4.5 µm (right panel), shown at the top and represented by dots of different colours for each AOR. The relevant best-fit models, including instrumental systematics, are overplotted with solid lines. Note that the second AOR of each visit was discarded from the light-curve fits. The bottom panels show residuals from the above light curves and models (dots), and standard deviations (black lines).