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Fig. 4

image

Full extent of the discovered 626 CO2 magnetic dipole band. Panel A: combination of ACS MIR spectra observed in diffraction orders 178–180, with a best-fit synthetic model containing apparent contributions of the CO2 and H2O based on HITRAN 2016 database. Panel B: residual, revealing the structure of the 01111-00001 626 absorption band with P-, Q- and R-branches. Calculated line positions are marked with red (P), green (Q), and blue (R) arrows. The example spectrum was recorded in orbit 6975 (Ls = 40.3°, 70.9°N, 21.6°W) and corresponds to the tangent altitude of 10.4 km. Panel C: best-fit synthetic model accounting for the new lines with corresponding residuals in panel D.

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