Same as Fig. 3 for a different spectral interval characterized by absorption lines of H₂O, CH₄, and O₃. Top: TAPAS transmittance spectra (right scale). Bottom: data (in black) fit to the product of their convolved product by a fifth-order polynomial (green curve). The fit polynomial is displayed separately (red curve). The two data gaps are due to the transitions between the detectors of the instrument. Middle: differences between the data and the model expressed as the percentage of the fit continuum. A few weak and sharp absorption lines are absent from the model and were identified as due to C₂H₆ and HCl (see text).