\\ Species Tag:        &   21001 & Name:&  HDO-18        
\\ Version:            &       1 & & Water,
\\ Date:       &  Jan. 1991      & & singly deuterated $^{18}$O
\\ Contributor:&  E. A. Cohen    & & isotope
\\             &                 & &
\\ Lines Listed:       &     952 & Q(300.0)=&      148.730
\\ Freq. (GHz) $<$     &    9981 & Q(225.0)=&       96.783
\\ Max. J:             &      13 & Q(150.0)=&       52.954
\\ LOGSTR0=            &    -8.9 & Q(75.00)=&       19.081
\\ LOGSTR1=            &    -8.8 & Q(37.50)=&        7.034
\\ Isotope Corr.:      &  -6.2130& Q(18.75)=&        2.740
\\ Egy. (cm$^{-1}$) $>$&     0.0 & Q(9.375)=&        1.341
\\ $\mu_a$ = &0.6715             & A=&692844.04
\\ $\mu_b$ = &1.7261             & B=&271457.501
\\ $\mu_c$ = &                   & C=&190812.982
\headend

We have used G. Steenbeckeliers' microwave data as compiled by F. J. Lovas, 1978,
J.~Phys.~Chem.~Ref.~Data\ {\bf 7}, 1445.  These data have been combined
with energy levels derived by R.~A. Toth, private communication, from new
high-resolution infrared spectra to produce the fit upon which the calculation
is based.  The dipole moment components were estimated from those of HDO.