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Table A.1
Observed line fluxes 
(K km s-1) for H2CO and its isotopic species.
| Frequency | Transition | E up | A | Sources | ||
| [GHz] | [K] | [s-1] | IRAS 20126+4104 | IRAS 18089-1732 | G31.41+0.31 | |
|
|
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| H2CO | ||||||
|
|
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| 218.222p | 30,3–20,2 | 21 | 2.8(–4) | 2.82 (0.65) | – | >7.14 (1.71) |
| 218.476p | 32,2–22,1 | 68 | 1.6(–4) | – | – | 4.15 (1.03) |
| 363.946p | 52,4–42,3 | 100 | 1.2(–3) | 4.65 (1.08) | 9.92 (2.15) | >20.29 (3.31) |
| 364.103p | 54,1/2–44,0/1 | 241 | 5.0(–4) | 1.90 (0.58) | 4.25 (1.07) | 10.97 (2.88) |
| 364.275o | 53,3–43,2 | 143/158 | 8.9(–4) | >5.08 (1.50) | >12.62 (3.34) | >21.56 (5.08) |
| 364.289o | 53,2–43,1 | 143/158 | 8.9(–4) | >5.78 (1.71) | >10.68 (2.83) | >20.46 (4.85) |
|
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| H213CO | ||||||
|
|
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| 219.909 o | 31,2–21,1 | 33 | 2.6(–4) | <0.34 | 1.08 (0.60) | 1.60 (0.55) |
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