Comparison from Na I D with previous detection reported in this data set where the used pass-band was 0.75 Å. Top panel: transit photometry derived by S2008 (grey) and this work (black). The correction proposed by S2008 for CCD non-linearity was applied in this work. Solid lines represent the transit fits for this work (black) and S2008 (grey). The latter used a scaled version of HST photometry integrated over 582 and 638 nm which includes limb darkening contribution. Bottom panel: R2008 based analysis for the Na I D transmitted signal and its uncertainty derived from the bootstrap analysis. Green colour represent the in-out scenario, blue colour in-in scenario, and red colour the out-out scenario. The centre and 1σ of each distribution is shown at the bottom.