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Table 2:

Observed H2O, H218O and CH transitionsa.

Transition 		$\nu$ $\lambda$ $E_{\rm u}/k_{\rm B}$ A Beam $t_{\rm int}$b
  (GHz) ($\mu$m) (K) (10-3 s-1) ('') (min.)
H2O    111-000 1113.34 269.27 53.4 18.42 19 43.5
202-111 987.93 303.46 100.8 5.84 22 23.3
211-202 752.03 398.64 136.9 7.06 29 18.4
312-303 1097.37 273.19 249.4 16.48 20 32.4
312-221 1153.13 259.98 249.4 2.63 19 13.0

H218O    110-101 		547.68 547.39 60.5 3.59 39 64.3
111-000c 1101.70 272.12 52.9 21.27 20 43.5
202-111 994.68 301.40 100.7 7.05 22 46.7
312-303c 1095.16 273.74 289.7 22.12 20 32.4

CHd    3/2, 2--1/2, 1+ 		536.76 558.52 25.8 0.66 39  
3/2, 1--1/2, 1+ 536.78 558.50 25.8 0.23 39  
3/2, 1--1/2, 0+ 536.80 558.48 25.8 0.46 39  

Notes. (a) From the JPL database of molecular spectroscopy (Pickett et al. 1998); (b) total on + off integration time; (c) observed in the same setting as the main isotopologue; (d) observed with H218O 110-101.


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