Spectral signatures of carbon dioxide and ozone at Mars

This graph shows an example of the measurements made by the Atmospheric Chemistry Suite (ACS) MIR instrument on ESA's ExoMars Trace Gas Orbiter (TGO), featuring the spectral signatures of carbon dioxide (CO₂) and ozone (O₃).

The bottom panel shows the data (blue) and a best-fit model (orange).

The top panel shows the modelled contributions from a variety of different gases for this spectral range. The deepest lines come from water vapour (light blue). The strongest O₃ feature (green) is on the right, and distinct CO₂ lines (grey) appear on the left. The locations of strong methane features (orange) are also shown in the modelled contributions, though methane is not observed in the TGO data.

More information: ExoMars finds new gas signatures in the martian atmosphere