WASP-33b spectrum model using a full inversion (FI) and no inversion (NI) of the T/P profile. The left panel shows the WASP-33b model spectrum for both FI-spec and NI-spec. The color shade represents the wavelength range of the observed order; blue and orange represent the wavelength range in the blue and red CCDs, respectively. The vertical axis shows the planet to star flux contrast in the level of 10−3. The middle panel shows the weight function along the wavelength for the pressure range considered. The right panel shows our adopted temperature profile for the WASP-33b atmosphere.