\\ Species Tag:        &   13002 & Name:&  CH             
\\ Version:            &       1 & & Methylidyne
\\ Date:       & Feb. 1984       & & X $^2 \Pi$ states
\\ Contributor:&  H. M. Pickett & & 
\\             &                 & & 
\\ Lines Listed:       &     324 & Q(300.0)=&      120.837 
\\ Freq. (GHz) $<$     &    9926 & Q(225.0)=&       91.369 
\\ Max. J:             &      12 & Q(150.0)=&       62.001 
\\ LOGSTR0=            &    -9.5 & Q(75.00)=&       32.923 
\\ LOGSTR1=            &    -6.9 & Q(37.50)=&       18.845 
\\ Isotope Corr.:      &     0.  & Q(18.75)=&       12.201 
\\ Egy. (cm$^{-1}$) $>$&     0.0 & Q(9.375)=&        8.960 
\\ $\mu_a$ = & 1.46              & A=& 
\\ $\mu_b$ = &                   & B=& 425472.8
\\ $\mu_c$ = &                   & C=& 
\headend 
 
      The laboratory spectra of C. R. Brazier and J. M. Brown, 1983, J. Chem.
Phys. {\bf 78}, 1608--1610, and M. Bogey, C. Demuynck, and J. L. Destombes,
1983, Chem. Phys. Lett. {\bf 100}, 105-109, were combined with the data
of O.~E.~H. Rydbeck {\it et al.}, 1974, Astron. Astrophys. {\bf 34}, 479, 
and the predictions of the rotational lines given by J.~M.~Brown and 
K.~M.~Evenson, 1983, Astrophys.~J.~{\bf 268}, L51, in a fit to a Hund's 
case (b) Hamiltonian with eight fine structure parameters, the B and D 
parameters, and seven hyperfine parameters.  Calculated values are given 
for the rotational transition.  The dipole moment was taken from D. J. 
Phelps and F. W. Dalby, 1966, Phys. Rev. Lett. {\bf 16}, 3.