S.1 Validation of CO measurements between the ACS channels
From the beginning of Exomars TGO science program in 2018 the simultaneous observations of the same gases by TGO spectrometers allowed us to validate measurements and methods. It was done firstly for comparison of temperature and CO2 density profiles retrieved by ACS NIR and MIR in different CO bands (Alday et al., 2019; 2021; Fedorova et al., 2020).