Fig. 11.
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Distribution of the rotational temperatures of H2 (top) and high-J CO (bottom) in low-mass protostars. Temperatures in Class 0 protostars are shown in red, and in Class I sources in blue. The warm gas component is shown in stripped bins, and the hot one in clear bins. H2 results for Class 0 protostars are adopted from Francis et al. (2025), and CO results for both Class 0 and I are from Karska et al. (2018).
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