Table C.1
and 
ratios taken from the literature that are included in Figs. 3 and 4
| Source | Type(1) |  |
 |
Refs |
|---|---|---|---|---|
| B1-c | LMP | 2.8±0.9(− 2) | 1.3±0.2(− 1) | 1,2 |
| Serpens S68N | LMP | 1.4±0.6(− 2) | 1.2±0.5(− 1) | 1,2 |
| B1-bS | LMP | <1.8(− 2) | – | 1,2 |
| HH212 | LMP | 3.8±2.3(− 2) | – | 3 |
| 8.1±3.0(− 3) | – | 4 | ||
| IRAS 16293A | LMP | 2.8±1.2(− 2) | 2.0±0.7(− 1) | 5,6 |
| IRAS 16293B | LMP | 2.4±0.9(− 2) | 2.5±0.9(− 1) | 6,7 |
| IRAS 2A | LMP | 1.9±1.0(− 2) | 7.0±2.6(− 1) | 8 |
| IRAS 4A | LMP | 1.4±0.8(− 2) | 5.6±2.2(− 1) | 8 |
| L483 | LMP | 7.8±3.3(− 3) | – | 9 |
| BHR71 | LMP | 9.6±4.1(− 3) | – | 10 |
| Ser-emb 1 | LMP | <2.0(− 1) | – | 11 |
| Ser-emb 11W | LMP | <4.3(− 2) | – | 12 |
| HOPS-108 | LMP | 7.0±3.8(− 3) | – | 13 |
| G192.12-11.10 | LMP | 9.8±5.8(− 3) | – | 14 |
| G205.46-14.56S1-A | LMP | 6.7±3.3(− 3) | – | 14 |
| G208.68-19.20N1 | LMP | 1.3±0.6(− 2) | – | 14 |
| G210.49-19.79W-A | LMP | 1.4±0.6(− 2) | – | 14 |
| G211.47-19.27S | LMP | 1.7±0.4(− 2) | – | 14 |
| V883 Ori | LMP | 4.8±1.0(− 2) | – | 15 |
| Serpens SMM1-a | IMP | 3.6±2.1(− 3) | – | 16 |
| NGC 7192 FIRS2 | IMP | 1.9±0.8(− 3) | – | 17 |
| Cep E-A | IMP | 1.2±0.4(− 2) | – | 18 |
| Sgr B2(N2) | HMP | 4.0±1.7(− 4) | – | 19,20 |
| NGC6334I MM1 I | HMP | 3.0±1.7(− 4) | – | 21 |
| NGC6334I MM1 II | HMP | 1.8±0.9(− 4) | – | 21 |
| NGC6334I MM1 III | HMP | 3.2±1.8(− 4) | – | 21 |
| NGC6334I MM1 IV | HMP | 1.6±1.0(− 4) | – | 21 |
| NGC6334I MM1 V | HMP | 2.3±1.1(− 4) | – | 21 |
| NGC6334I MM2 I | HMP | 6.0±3.6(− 4) | – | 21 |
| NGC6334I MM2 II | HMP | 1.5±0.7(− 4) | – | 21 |
| NGC6334I MM3 I | HMP | 2.4±1.1(− 4) | – | 21 |
| NGC6334I MM3 II | HMP | 2.6±1.1(− 4) | – | 21 |
| Orion KL ridge | HMP | 1.7±0.7(− 3) | – | 22 |
| Orion KL HC | HMP | <1.7(− 3) | – | 22 |
| CygX-N30 | HMP | <1.7(− 3) | – | 23 |
| L1495-B106 | LMPC | 1.4±0.4(− 2) | – | 24 |
| L1495-B107 | LMPC | 4.8±1.3(− 2) | – | 24 |
| L1495-B108 | LMPC | 5.2±1.5(− 2) | – | 24 |
| L1495-B109 | LMPC | 4.6±1.1(− 2) | – | 24 |
| L1495-B1010 | LMPC | 4.2±1.3(− 2) | – | 24 |
| L1495-B1011 | LMPC | <1.9(− 2) | – | 24 |
| L1495-B1012 | LMPC | 2.0±0.4(− 2) | – | 24 |
| L1495-B1013 | LMPC | <3.5(− 2) | – | 24 |
| L1495-B1014 | LMPC | <1.4(− 2) | – | 24 |
| L1495-B1015 | LMPC | 4.0±1.1(− 2) | – | 24 |
| L1495-B1016 | LMPC | 3.0±1.0(− 2) | – | 24 |
| L1495-B1017 | LMPC | 8.8±2.7(− 2) | – | 24 |
| L183 | LMPC | 1.3±0.2(− 2) | – | 25 |
| L1544 | LMPC | 3.0±1.3(− 2) | – | 26 |
| I00117-MM2 | HMSC | <2.4(− 3) | – | 27 |
| AFGL 5142-EC | HMSC | 9.0±3.8(− 4) | – | 27 |
| 05458-mm3 | HMSC | 2.3±1.0(− 3) | – | 27 |
| G034-G2(MM2) | HMSC | 1.4±0.6(− 2) | – | 27 |
| G034-F2(MM7) | HMSC | <2.5(− 3) | – | 27 |
| G034-F1(MM8) | HMSC | <1.5(− 3) | – | 27 |
| G034-C1(MM9) | HMSC | <8.7(−4) | – | 27 |
| I20293-WC | HMSC | <1.9(−3) | – | 27 |
| I22134-G | HMSC | <1.7(−3) | – | 27 |
| I22134-B | HMSC | <6.7(−3) | – | 27 |
Notes. The 
and 
ratios are either directly taken from the reported literature or computed using Eqs. (2) and (3) using the column densities from the reported literature. A 30% uncertainty was assumed in cases where no uncertainty was reported. (1) LMP: low-mass protostar, IMS: intermediate-mass protostar, HMS: high-mass protostar, LMPC: low-mass prestellar core, HMSC: high-mass starless core.
References. 1: van Gelder et al. (2020); 2: Appendix D; 3: Lee et al. (2019a); 4: Bianchi et al. (2017b); 5: Manigand et al. (2020); 6: Drozdovskaya et al. (2022); 7: Jørgensen et al. (2018); 8: Taquet et al. (2019); 9: Jacobsen et al. (2019); 10: Yang et al. (2020); 11: Martín-Doménech et al. (2019); 12: Martín-Doménech et al. (2021); 13: Chahine et al. (2022); 14: Hsu et al. (2022); 15: Lee et al. (2019b); 16: Ligterink et al. (2021); 17: Fuente et al. (2014); 18: Ospina-Zamudio et al. (2018); 19: Belloche et al. (2016); 20: Müller et al. (2016); 21: Bøgelund et al. (2018); 22: Neill et al. (2013); 23: van der Walt et al. (2021); 24: Ambrose et al. (2021); 25: Lattanzi et al. (2020); 26: Bizzocchi et al. (2014); 27: Fontani et al. (2015).
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