Similar to Fig. 12 with simulated combined transmission spectra. Observations and their error bars are in blue. Simulated combined transit transmission sp- ectra expected for CO₂ dominated atmospheres is in red, for Earth-like atmospheres in blue-green, for Venus-like atmospheres in orange and for Titan-like atmospheres in brown. Corresponding colo- ured hexagons give the value expected from the models at the wavelengths of the observations. Wavelength is in log scale.