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Table A.1.

Summary statistics of posterior values obtained from the MCMC sampling as well as for the fiducial spectral simulation. Uncertainties correspond to the 2nd and 97th percentile posterior likelihood (i.e., the 95% highest posterior densities); values without uncertainties are fixed to their prior values. Excitation temperatures and line widths are shared amongst the four velocity components.

Velocity component Model Aa Model Bb Model Cc
Source size (″)

1 54 70 70
2 35 111 111
3 99 269 269
4 39 228 228

Velocity (vlsr—km/s)

1 5.575
2 5.767
3 5.892
4 6.018

Column density (Ncol—cm−2)

1 2.31 × 1011
2 6.00 × 1011
3 3.67 × 1011
4 5.33 × 1011

Excitation temperature (Tex—K)


Line width (dv—km/s)




Model A uses the posterior parameters of HC9N as a prior; with the exception of source sizes, all parameters are fitted.


Model B uses the posterior parameters of c-C6H5CN as a prior; with the exception of source sizes, all parameters are fitted.


Model C uses the posterior mean of c-C6H5CN for the spectral simulation; however, it does no further optimization. Values are adapted from McGuire et al. (2021).

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