Raw light curves extracted from HST/WFC3 observations of WASP-117b. Each light curve is constructed by the integration of a 5-pixel-wide wavelength bin. Colors of the light curve represent their central wavelengths (using a rainbow color scheme, from red for the longest wavelength (1.67 μm) to blue for the shortest (1.11 μm)). Light-curve systematics are clearly visible, particularly at the first orbit of the observations. The gray curves show the best-fitting RECTE+transit profile models.