\\ Species Tag:        &   51008 & Name:&  HNCCC  
\\ Version:            &       1 & & 3-Imino-
\\ Date:       &  Jan. 1995      & & 1,2-propa-
\\ Contributor:&  M. L. Delitsky & & dienylidene 
\\             &  H. M. Pickett  & &
\\ Lines Listed:       &     574 & Q(300.0)=&    4017.0039
\\ Freq. (GHz) $<$     & 931.415 & Q(225.0)=&    3014.3657
\\ Max. J:             &      99 & Q(150.0)=&    2009.8453
\\ LOGSTR0=            &   -10.0 & Q(75.00)=&    1005.3423
\\ LOGSTR1=            &  -100.0 & Q(37.50)=&     503.1517
\\ Isotope Corr.:      &   0.0   & Q(18.75)=&     252.0726
\\ Egy. (cm$^{-1}$) $>$&         & Q(9.375)=&     126.5386 
\\ $\mu_a$ = & 5.665             & A=&        
\\ $\mu_b$ = &                   & B=& 4668.338
\\ $\mu_c$ = &                   & C=&          
\headend

The observed frequency measurements were taken from: Y. Hirahara, Y.
Oshima and Y. Endo, 1993, Astrophys. J. {\bf 403}, L83. Kawaguchi {\it
et al.}, 1992, Astrophys. J. {\bf 396}, L49.

The dipole moment was calculated by P. Botschwina, M. Horn, S. Seeger
and J. Fl\"ugge, 1992, Chem. Phys. Lett. {\bf 195}, 427.

Although quantum calculations of the structure indicate that the
molecule may be non-linear, spectral measurements are available only
for the $K=0$ state. For the purposes of fitting the spectra and
predicting frequencies and intensities, the $K=0$ states are equivalent
to a linear molecule. The catalog entries for this species are
currently presented as a linear molecule, and the intensities are
calculated for a unit concentration of $K=0$ molecules in the ground
vibrational state.