Zoom conto airmass = 2.0 data showing final combined scans (dark blue) and model predictions (red) in selected frequency ranges. All individual scan s are also shown (light blue) and line identifications are a)so provided. The dashed green lines (with scales on the right of each panel) show the ΔT_EBB resulting from ATM model simulations with the standard and modified vertical profiles shown in Fig. 5. The data are shown before the recalibration described in Sect. 4.2 because we wanted to show the individual raw scans. Therefore, in this figure it is the ATM model results that have been shifted to match the observed level before recalibration. The different panels are discussed in the text.