RADEX diagnostic plots of CO 2–1 (top), 3–2 (middle) and 4–3 (bottom). The derived line ratios of the blue flow of Serpens SMM1 are highlighted in red to serve as an illustration for the sub-thermal and thermal excitation scenarios. It is evident that temperatures below 50 K are excluded in all limits as ratios of CO 2–1 and 3–2 over 6–5 do not agree with those of 4–3.
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