Fig. 4.
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Spectra of APEX CO(3–2) and ALMA CO(1–0) (from Zschaechner et al. 2016) summed within a r = 1 kpc (r = ∼49″) aperture. The ALMA data was rescaled in flux density to CO(3–2) by multiplying a factor of r31 = 0.31 ± 0.11 and the squared ratio of the CO(3–2) (νrest = 345.796 GHz) and CO(1–0) (νrest = 115.271 GHz) line frequencies. The light red region shows the 1σ error (68% confidence interval).
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