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).