\\ Species Tag:        &   49004 & Name:&  MgCCH          
\\ Version:            &       1 & & Magnesium acetylide
\\ Date:       &  Sept. 1995     & & X $^2\Sigma$ 
\\ Contributor:&  J. C. Pearson  & & 
\\                     &         & & 
\\ Lines Listed:       &     274 & Q(300.0)=&     2498.1078
\\ Freq. (GHz) $<$     &     999 & Q(225.0)=&     1873.8091
\\ Max. J:             &      99 & Q(150.0)=&     1249.0657
\\ LOGSTR0=            &    -8.0 & Q(75.00)=&      624.6680
\\ LOGSTR1=            &    -8.0 & Q(37.50)=&      312.6183
\\ Isotope Corr.:      &         & Q(18.75)=&      156.6313
\\ Egy. (cm$^{-1}$) $>$&     0.0 & Q(9.375)=&       78.6485
\\ $\mu_a$ = & 1.000             & A=& 
\\ $\mu_b$ = &                   & B=& 5010.38    
\\ $\mu_c$ = &                   & C=& 
\headend 
 
The observed lines are from:

M. A. Anderson and L. M. Ziurys, 1995, Astrophys. J. {\bf439}, L25 -- L28. 
     
The dipole moment is unknown and has been assumend to be unity. The molecule is
in a $^2\Sigma$ electronic ground state.