Fig. 3.
Upper limit of the [CI](2-1)/CO(7-6) flux ratio of AGS4 (blue arrows), compared with existing observations of local and high-redshift MS galaxies, starburst galaxies and AGNs (data compiled in Valentino et al. 2018, 2020). If the detected emission line is indeed CO(7-6), then the flux ratio would fall at the lower end of the trend shown by the existing observations.
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