Table 1: The permanent dipole moments of the molecules and the rest frequencies of the observed transitions.
Molecule $\mu~^a$ Transition $\nu~^a$
  (Debye)     (MHz)
\ensuremath {{\rm HCN}} 2.98   F=1-1 88630.416
    J=1-0 F=2-1 88631.847
      F=0-1 88633.936
\ensuremath{{\rm H^{13}CN}} 2.98   F=1-1 86338.767
    J=1-0 F=2-1 86340.184
      F=0-1 86342.274
\ensuremath {{\rm HNC}} b 3.05   F=1-1 90663.656
    J=1-0 F=2-1 90663.574
      F=0-1 90663.450
\ensuremath {{\rm HN^{13}C}} b 2.70   F=1-1 87090.942
    J=1-0 F=2-1 87090.859
      F=0-1 87090.735
\ensuremath{{\rm H^{15}NC}} 2.70 J=1-0   88865.715
\ensuremath {{\rm NH_3}} 1.48 (J,K)= (1,1) 23694.495
    (J,K)= (2,2) 23722.633
        a http://spec.jpl.nasa.gov.

        b Frequencies from Frerking et al. (1979).


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