Upper panel: 2-min bin uncorrected light curve with the overlaid best-fitting model considering the occultation model and the base-line model. The corrected K_S light curve of WASP-4b is shown in the middle panel, including the complete data set, where the resulting rms in the out-of-eclipse points is 0.0069. In the bottom panel each data point corresponds to a 2-min bin along with its error and the best-fitting occultation model. The residuals for this curve are shown with an offset of 0.006 and present a rms of 0.00072. A color version of this figure is available in the electronic form.