(a) An example of a light curve for a single pixel and its fit that identifies it as having two components. (b) An example of a light curve for a single pixel and its fit that identifies it as having a single component. Red and blue curves in panels (a) and (b) are the exponential curve fits to the decaying components with time constants t_decay1 and t_decay2, respectively. The vertical dotted green lines show the peak of the WL enhancement. Reduced ﹩{\chi }^{2}﹩ of the fittings to single component (﹩{\chi }_{\mathrm{single}}^{2}﹩) and double components (﹩{\chi }_{\mathrm{double}}^{2}﹩) are shown at the top-right side in each panel.