\\ Species Tag:        &   52011 & Name:&  CH2F2-v4      
\\ Version:            &       1 & &Difluoro methane,
\\ Date:       & Nov. 1989       & &$\nu_4$ state
\\ Contributor:& H. M. Pickett & &
\\             &                 & &
\\ Lines Listed:       &    7808 & Q(300.0)=&    55398.785
\\ Freq. (GHz) $<$     &    3189 & Q(225.0)=&    34017.324
\\ Max. J:             &      79 & Q(150.0)=&    17992.842
\\ LOGSTR0=            &    -8.0 & Q(75.00)=&     6324.120
\\ LOGSTR1=            &    -7.0 & Q(37.50)=&     2239.752
\\ Isotope Corr.:      &     0.0 & Q(18.75)=&      794.877
\\ Egy. (cm$^{-1}$) $>$&   528.5 & Q(9.375)=&      283.270
\\ $\mu_a$ = &                   & A=& 49480.535
\\ $\mu_b$ = &   1.9785          & B=& 10582.942
\\ $\mu_c$ = &                   & C=& 9216.495
\headend
Far-infrared spectra are from M. Carlotti {\it et al.}, 1988, J. Mol.
Spect. {\bf 132}, 158. These frequencies were multiplied by 0.9999982
to bring the ground state lines more in agreement with the microwave and 
submillimeter data. The dipole moment is from K. Kawaguchi and T. Tanaka,
 1986, J. Mol.  Spect. {\bf 68}, 125. The partition function includes
 allowance for the vibrational states.