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Table A.1
H2O masers.
| Frequency | Transition | ν 2 | E U | Spin | Discovery |
| (GHz) | (JKa,Kc) | (K) | (level) | (reference) | |
|
|
|||||
| 22.23508 | 61,6–52,3 | 0 | 643 | o | C69 |
| 321.22564 | 102,9–93,6 | 0 | 1862 | o | M90 |
| 325.15292 | 51,5–42,2 | 0 | 470 | p | M91 |
| 658.00655 | 11,0–10,1 | 1 | 2361 | o | M95 |
Notes. ν2: vibrational state; spin: ortho/para isomers.
Reference. C69 Cheung et al. (1969); M90 Menten et al. (1990); M91 Menten & Melnick (1991); M95 Menten & Young (1995).
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