Fig. 8
Transmission spectra around the Na feature (upper panel) and K feature (lower panel). The bin size is 50 Å for Na and 100 Å for K. The values of Na and K bins from the HST observation (A2018) are also plotted as black points. The LBT results have similar or even smaller errors than the HST data points. The spectra are in general flat. The wavelengths from different observations are slightly shifted for clarity.
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