Differential ﹩{R}_{{\rm{P}}}/{R}_{\star }﹩ measurements between a bin centered on the Na I doublet and a continuum bin from 675 to 685 nm (black squares). This is a weighted mean of all observations. Overplotted with blue circles are the values obtained from an atmospheric model assuming an aerosol-free model with no TiO opacity (Fortney et al. 2010).