Notes. Table adapted from Avison et al. (2023) and Frimpong (2021). Distances and luminosities are taken from Lumsden et al. (2013) and Peretto & Fuller (2009). The rest of the parameters are from Avison et al. (2023) and Frimpong (2021). Columns: (1) Name of the sources, (2) and (3) RA and DEC coordinates, respectively, (4) kinetic distances, derived from CO emission lines and rotation curves from Reid et al. (2009), (5) Galactocentric distance calculated with the kinematic distance, the Galactic centre distance from the Sun (8.5 kpc adopted by the International Astronomical Union), and the Galactic longitude of the sources, (6) bolometric luminosity, (7) local standard rest frame velocity, and (8) gas temperatures assumed from the excitation temperature of CH₃CN (where the temperature of CH₃CN was not available the temperature of CH₃OH was used instead), (9) and (10) the H₂ column density (N_gas) and mass (M_gas), respectively, and (11) the radio flux measured from the continuum maps at 1.24–1.33 mm. ^(a) Spectrum normalized by the brightest line in the CH₃OH 5–4 ladder at average rest frequency ν_lsr ≈ 241.75 GHz. ^(b) Spectrum normalized by the brightest line in the CH₃CCH 14–13 ladder between rest frequencies ν_lsr ≈ 239.13–239.25 GHz. ^(c) Spectrum normalized by the peak intensity of C³⁴S at average rest frequency ν_lsr ≈ 241.01609 GHz. ^(*)Spectrum not considered for PCA due to a lack of HC₃N, H₂CO, CH₃OH, CH₃CN, and CH₃CCH emission.