13CO 3−2/6−5 intensity ratio as a function of density and gas temperature calculated via RADEX for N(13CO) = 1.5 × 1014 cm-2. Red markers indicate the observed intensity ratios for the central pixels for Class 0 sources whereas blue markers are for Class I sources. Both pixels are taken to be 15″ diameter. The corresponding densities are the values at the 7.5″ radius found in the power-law envelope models of Kristensen et al. (2012).
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