Table 1: Parameters of observed rotational transitions.

Species		 Transition $E_{\rm l}^a$ (K) $\nu$ (MHz)

${\rm NH_3}$		 (J,K=1,1) 22.70 23 694.496
${\rm NH_3}$ (J,K=2,2) 63.89 23 722.633
${\rm NH_{2}D}$ (para) 111-101 16.55 85 926.3
${\rm NH_{2}D}$ (ortho) 111-101 15.98 110 153.6
${\rm NHD_2}$ (ortho) 110-101 13.33 110 812.9
${\rm NHD_2}$ (para) 110-101 13.09 110 896.7
${\rm C^{18}O}$ J=1-0 0.0 109 782.1734
${\rm C^{18}O}$ J=2-1 5.27 219 560.3568
${\rm C^{17}O}$ J=2-1 5.39 224 714.3850
${\rm H^{13}CN}$ J=1-0, F=2-1 0.0 86 340.184
${\rm HC^{15}N}$ J=1-0 0.0 86 054.961

Note: a $E_{\rm l}$ is the lower energy level of the transition.

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