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Fig. 5

image

BF-HST seen at various zoom levels. Panel a: whole transmission spectrum obtained after the parameters have been adjusted to reproduce the combined low-resolution data set. Panel b: zoom on the two STIS and the ACS data sets. The different colours correspond to models convolved with the different instrumental LSF (solid lines) and binned (dots). At the resolution of STIS G750M sodium is still quite sharp, while the lower resolution of ACS smears out the potassium doublet. This region of the spectrum is particularly sensitive to the presence of haze scattering. Panel c: zoom on the WFC3 data set. The water band is clearly visible; however, its intensity is reduced in comparison to an aerosol-free model.

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