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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 61,652,3 0 643 o C69
321.22564 102,993,6 0 1862 o M90
325.15292 51,542,2 0 470 p M91
658.00655 11,010,1 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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