Table 3
Molecules employed in this work and their transitions.
| Species | Transitions | Label | Beams size | HFS | Coll. | Ref. | DB | Training |
|---|---|---|---|---|---|---|---|---|
| C18O | 1-0, 2-1, 3-2 | 1-0, 2-1, 3-2 | 22”, 28”, 28”4 | n | o∕p-H2 | (1) | L | – |
| HCO+ | 1-0, 2-1, 3-2 | 1-0, 2-1, 3-2 | 28”, 28”, 23” | n | o∕p-H2 | (2) | L | 1-0, 3-2 |
| DCO+ | 1-0, 3-2 | 1-0, 3-2 | 36”, 12” | n | H2 | (2) | L | 1-0, 3-2 |
| o-H2D+ | 110−111 | 1-0 | 16” | n | o/p-H2 | (3, 4) | L | 1-0 |
| p-H2D+ | 101−000 | 1-0 | 28” | n | o/p-H2 | (3, 4) | L | − |
| p-D2H+ | 110−101 | 1-0 | 28” | n | o/p-H2 | (3) | L | − |
| N2H+ | 1-0, 3-2 | 1-0, 3-2 | 27”, 12” | y | p-H2 | (5) | E | 1-0, 3-2 |
| N2D+ | 1-0, 3-2 | 1-0, 3-2 | 34”, 12” | y | p-H2 | (5) | E | 1-0, 3-2 |
| HCN | 1-0, 3-2 | 1-0, 3-2 | all 28” | y | p-H2, e− | (6, 7) | E | 1-0 |
Notes. The transitions column reports the quantum numbers J or the JKaKc. The label column reports the labels in the LOC notation that we use for convenience in the discussion and in the plots. Each beam size corresponds to the transitions in the second column. HFS indicates if a non-LTE hyperfine structure calculation has been made, while Coll. indicates the collisional partners: H2 represents the sum of the abundances of o-H2 and p-H2, while o/p-H2 indicates that the collisional rates are available for both the colliders. LOC allows us to use the actual radial profile of the o/p-H2 ratio as computed by the chemical code. References are (1) Yang et al. (2010), (2) Denis-Alpizar et al. (2020), (3) Hugo et al. (2009), (4) Koumpia et al. (2020), (5) Müller et al. (2005), (6) Faure et al. (2007), and (7) Dumouchel et al. (2010). DB indicates if the data are in the LAMDA (L) or EMAA (E) database. The transitions used for the NN training and in the analysis are listed in the last column (see text for details on the selected transitions).
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