Light curves of the best candidates as a function of time. (a)–(g) The symbols are the same as Figure 3, but here they denote the brightness at mid-night. The vertical lines (when visible) display the total range of the brightness changes during a night lasting 12 hr. (h) The nightly changes in the same scale. The selected phase interval of each light curve is the one that would induce the largest possible changes during a single night.