Peak Tb ratio between the CO(3−2) and CO(1−0) lines versus the H2 density, and the CO column density per unit velocity width (NCO/ΔV) for two values of the kinetic temperature: Tk = 45 K, the dust temperature (left), and Tk = 20 K (right). The black contours are underlining the values obtained in the data. The predictions come from the LVG hypothesis in the Radex code.
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