Pixel-per-pixel comparison of the ¹²CO and H₂ total column density maps. The maps are restricted to the field of observations mapped by both Spitzer/IRS, IRAM-30m, and APEX telescopes. The ¹²CO data points were obtained with opacity-corrected population diagrams Dell’Ova et al. (2020). The H₂ data points correspond to the results obtained with the thermal admixture SE description (see Sect. 5.2). We show the best linear fit associated with the sample of data points and the corresponding H₂-to-¹²CO molecular abundance.