Top (shifted by +0.5): EXES spectrum of Mars between 1388.05 and 1388.35 cm⁻¹, integratedover the Martian disk (thick black line), recorded with EXES on March 24, 2016 (Ls = 127°, normalized radiance). The synthetic model of the Martian atmosphere with the CO₂ contribution (red curve) corresponds to a Gaussian profile with a FWHM of 0.022 cm⁻¹. Bottom: EXES spectrum recorded on January 24, 2017, over the slit and summed over the six scans. The synthetic model corresponds to a Gaussian profile with a FWHM of 0.020 cm⁻¹.