\begin{table}%t3
  \caption{\label{t:dcop-data}Measured hyperfine splitting $\Delta ^a$ (kHz) and residual o$-$c 
    of \dcop, DNC, and HN\thc\ relative to a selected hyperfine component.} 
%\centerline
{
\begin{tabular}{lr@{}lr@{}l}
\hline \hline
Transition      & \multicolumn{1}{c}{Splitting} & \multicolumn{1}{l}{Residual$^b$} \\
\hline
\multicolumn{5}{l}{\dcop: $F = 2{-}1$ at 72~039.306~(3) MHz} \\
\hline
$1{-}1$         &	+47.58~(144)&    1.20 \\
$0{-}1$         & $-$64.64~(144)&    0.80 \\
\hline
\multicolumn{5}{l}{DNC: $I,F = 2{,}1{-}2{,}2 / 2{,}1{-}0{,}0$ at 76305.512~(3) MHz} \\
\hline
$1{,}1{-}1{,}1$     &  115.30~(100) & $-$0.18 \\
$2{,}3{-}2{,}2$     &  175.44~(100) & $-$0.72 \\
$1{,}2{-}1{,}1$     &  204.63~(100) &	 1.38 \\
$2{,}2{-}2{,}2$     &  277.57~(100) & $-$0.82 \\
$0{,}1{-}0{,}0$     &	  	    &	      \\       
$0{,}1{-}2{,}2$     &	  	    &	      \\
$1{,}0{-}1{,}1$     &  325.50~(250) &    1.60 \\
\hline
\multicolumn{5}{l}{HN\thc: $F_1,F_2,F = 0{,}1{,}1{-}1{,}2{,}2$ at 87~090.675~(3) MHz} \\
\hline
$2{,}2{,}2{-}1{,}1{,}1$ &  115.5~(50)   & $-$7.3 \\
$2{,}2{,}2{-}1{,}2{,}2$ &	&          &     &   \\
$2{,}2{,}1{-}1{,}1{,}0$ &	&          &     &   \\
$2{,}2{,}1{-}1{,}2{,}1$ &	&          &     &   \\
$2{,}3{,}3{-}1{,}2{,}2$ &  158.5~(50)   &    5.0 \\
$2{,}3{,}2{-}1{,}1{,}1$ &	&          &     &   \\
$2{,}3{,}2{-}1{,}2{,}1$ &	&          &     &   \\
$1{,}1{,}1{-}1{,}1{,}1$ &  210.7~(50)   &    1.5 \\
$1{,}2{,}2{-}1{,}2{,}1$ &	&          &     &   \\
$1{,}2{,}2{-}1{,}2{,}2$ &	&          &     &   \\
\hline
\end{tabular}}
\medskip
\par
If no numbers are given for the value of a measured splitting and its residual,
the hyperfine component overlaps with the previous component. The values of
the splitting and the residual refer to the respective intensity weighted
averages.\\
$^a$ Numbers in parentheses are one standard deviation in units 
 of the least significant figures.\\
$^b$ Residuals for DCO$^+$ refer to fit with $C_I$ kept fixed. 
 The residuals are zero if $C_I$ is released as two pieces of information 
 are then used to derive two parameters.
\end{table}