\begin{table}%t1
%\centering
\par
\caption{\label{tab1}Best-fit parameters in the ground state of CH$_2$D$^+$
given in MHz. For the sextic distortion constants on the right, only those of statistical significance are given.}
\begin{tabular}{l r|l r}
\hline \hline 
 &  &  &    \\[-3mm]
Symbol & Value & Symbol & Value   \\
\hline
  $A$            &   280~861.17(72) &  $\Phi_J$       &                         \\
  $B$            &   173~020.15(62) &  $\Phi_{JK}$    &                       \\
  $C$            &   105~684.83(64) &  $\Phi_{KJ}$    &     $-$0.0088(35)       \\
  $\Delta_J$     &     3.6124(94) &  $\Phi_{K}$     &                        \\
  $\Delta_{JK}$  &     10.824(51) &  $\phi_{J}$     &     0.00075(63)     \\
  $\Delta_{K}$   &      7.822(71) &  $\phi_{JK}$    &      0.0181(39)       \\
  $\delta_J$     &     1.4314(269) &  $\phi_{K}$     &                        \\
  $\delta_{K}$   &     12.556(111) &                 &                         \\
\hline
\end{tabular}
\vspace*{4mm}
\end{table}