\begin{table}%t2  
\caption{\label{t:nsr-theor}Computed nuclear spin-rotation constants $C_I$ (kHz) for \dcop,
HN\thc, and DNC$^{a}$.} 
%\centerline
{
\begin{tabular}{lclccclcc}
\hline \hline
Computational level & \multicolumn{1}{c}{\dcop} & & \multicolumn{3}{c}{HN\thc} & & \multicolumn{2}{c}{DNC} \\
\hline
                    & D        & & H        & N      & C     & & D        & N  \\
\hline
CCSD(T)/cc-pCVTZ    & $-$0.701 & & $-$4.551 & 22.954 & 6.194 & & $-$0.611 & 5.417 \\
CCSD(T)/cc-pCVQZ    & $-$0.695 & & $-$4.505 & 23.345 & 6.292 & & $-$0.605 & 5.502 \\
CCSD(T)/cc-pCV5Z    & $-$0.693 & & $-$4.486 & 23.471 & 6.330 & & $-$0.602 & 5.536 \\
CCSD(T)/aug-cc-pVTZ & $-$0.700 & & $-$4.575 & 22.878 & 6.200 & & $-$0.614 & 5.423 \\
CCSD(T)/aug-cc-pVQZ & $-$0.695 & & $-$4.510 & 23.318 & 6.295 & & $-$0.605 & 5.505 \\
CCSD(T)/aug-cc-pV5Z & $-$0.693 & & $-$4.486 & 23.456 & 6.331 & & $-$0.602 & 5.537 \\
\hline
\end{tabular}}
\medskip
\par
$^a$ The calculations have been performed at geometries obtained at the 
CCSD(T)/cc-pCVQZ level of theory 
(\dcop: $r({\rm CO}) = 1.10639$~\AA,\\ $r({\rm HC}) = 1.09236$~\AA; HN\thc, 
DNC: $r({\rm NC}) = 1.16927$~\AA, $r({\rm HN}) = 0.99526$~\AA).
\end{table}