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Fig. B.2

Fig. B.2 Refer to the following caption and surrounding text.

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Column density of the para-c-C3H2 21,1 - 20,2 transition of Per317 plotted with a colour gradient for a range of nH2Mathematical equation: ${n_{{{\rm{H}}_2}}}$ and Tkin. The contour white lines indicate the excitation temperature of the transition, Tex, and the red cross marks the nH2Mathematical equation: ${n_{{{\rm{H}}_2}}}$ and Tkin values derived in Pezzuto et al. (2021).

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