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Table 1
Details of the APEX HDO observations toward G34.26+0.15
| Frequency | Transition | E up |  (ortho-H2) |
 (para-H2) |
HPBW | B eff | T sys | dvb | Receiver |
| GHz | K | cm-3 | cm-3 | ′′ | K | km s-1 | |||
|
|
|||||||||
| 225.897 | 31,2–22,1 | 167.7 | 1.19 × 108 | 2.65 × 107 | 28 | 0.75 | 196–210 | 0.16 | APEX-1 |
| 241.561 | 21,1–21,2 | 95.3 | 4.00 × 107 | 1.03 × 107 | 26 | 0.75 | 218–235 | 0.15 | APEX-1 |
| 266.161 | 22,0–31,3 | 157.2 | 1.53 × 109 | 3.36 × 108 | 24 | 0.75 | 249–261 | 0.14 | APEX-1 |
| 464.924 | 10,1–00,0 | 22.3 | 1.61 × 106 | 3.74 × 105 | 14 | 0.53 | 498–528 | 0.08 | PI460 |
| 893.639 | 11,1–00,0 | 42.9 | 5.64 × 107 | 1.44 × 107 | 7 | 0.36 | 2656–3685 | 0.12 | CHAMP+ |
Notes.
(a)
Critical density at 100 K calculated with the values of the Einstein coefficient and the collision rates tabulated for HDO (Faure et al. 2012) in the LAMDA database (http://www.strw.leidenuniv.nl/moldata/).
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