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Table 2
Observational parameters of the OH transitions between the 
J = 3/2 and J = 1/2 states, observed in emission around 1835 and 1838 GHz, and of the OH transition between the 
J = 5/2 and J = 3/2 states, observed in absorption around 2514 GHz.
| Triplet | Transition | Frequency | Beam size | Observing | Integration time | Spectral resolution | Beam | Forward | Tsys |
| properties |
|
(GHz) | (′′) | date | (on source; s) | (km s-1) | efficiency | efficiency | (K) |
|
|
|||||||||
| Signal | 1 + → 1 − | 1837.7466 | |||||||
| 1838 GHz | 2 + → 1 − | 1837.8168 | 16.3 | 17/04/13 | 228 | 1.25 | 0.67 | 0.97 | 2689 |
| 163.1 μm | 1 + → 0 − | 1837.8370 | |||||||
|
|
|||||||||
| Image | 1− → 1 + | 1834.7355 | |||||||
| 1835 GHz | 2− → 1 + | 1834.7474 | 16.3 | 17/04/13 | 228 | 1.25 | 0.67 | 0.97 | 2689 |
| 163.4 μm | 1− → 0 + | 1834.7504 | |||||||
|
|
|||||||||
| Signal | 2− → 2 + | 2514.298730 | |||||||
| 2514 GHz | 3− → 2 + | 2514.316705 | 11.9 | 17/04/13 | 378 | 0.91 | 0.70 | 0.97 | 9687 |
| 119.2 μm | 2− → 1 + | 2514.353490 | |||||||
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