Transmission spectrum reproduced with 50 Å-wide bins, as compared to Fig. 10, for domains where the possible presence of optical absorbers, such as sodium (left column) and potassium (right column), would result in an increased planetary radius. The theoretical atmospheric models are also overplotted in addition to the inferred radii, and their colours correspond to those in Fig. 10, which have again been binned to the resolution of the spectrum and plotted for 1.6 scale heights, as was performed for the overall spectrum. It must be noted that these models have not been fitted to the data points and the transmission spectrum data have not been used as a priori for the production of the model atmospheres. The black shaded region in the right column highlights the region where telluric absorption as a result of the O₂ (A) lines introduces significant systematics in the light curves produced in this region.