\\ Species Tag:        &   64004 & Name:&  C4O 
\\ Version:            &       1 & & Tetracarbon monoxide 
\\ Date:       &  April 1996     & & X $^3 \Sigma ^-$
\\ Contributor:&  H. S. P.  M\"uller & & 
\\             &                 & & 
\\ Lines Listed:       &     535 & Q(300.0)=&     7965.1375
\\ Freq. (GHz) $<$     &     478 & Q(225.0)=&     5970.2221
\\ Max. J:             &      99 & Q(150.0)=&     3975.5997
\\ LOGSTR0=            &    -9.5 & Q(75.00)=&     1981.2949
\\ LOGSTR1=            &    -7.5 & Q(37.50)=&      984.3175
\\ Isotope Corr.:      &         & Q(18.75)=&      485.9881
\\ Egy. (cm$^{-1}$) $>$&     0.0 & Q(9.375)=&      237.0869
\\ $\mu_a$ = & 2.577             & A=& 
\\ $\mu_b$ = &                   & B=&  2351.262 
\\ $\mu_c$ = &                   & C=&  
\headend 

The data were taken from 
 Y. Ohshima, Y. Endo, and T. Ogata, 
1995, J. Chem. Phys. {\bf 102} 1493.

The dipole moment is from an $ab \ initio$ calculation: 
N. Moazzen-Ahmadi and F. Zerbetto, 
1995, J. Chem. Phys. {\bf 103}, 6343.

The partition function has been calculated up to $J$ = 199 
because of the low rotational constant.