\begin{table}%T2
\caption{\label{tab:dr}Rate coefficients ($k_{d{\rm r}} = \alpha(T/300)^{\beta}$) for the dissociative recombination of~H$_3^+$ and deuterated analogues.} 
%\centerline
{
\begin{tabular}{lllllc}
\hline\hline
Reaction && & $\alpha$   & $\beta$ & Ref. \\
     && & (cm$^3$~s$^{-1}$) & & \\
\hline
H$_3^+$  + e$^-$ & $\longrightarrow$  & ~H$_2$ +  ~H  & 1.36($-$8) &$-$0.5 & 1 \\
 & $\longrightarrow$  & ~H  +  ~H  +  ~H   &   5.44($-$8) &$-$0.5 & 1 \\
H$_2$D$^+$ + e$^-$ & $\longrightarrow$ &  ~HD +  ~H  &  1.20($-$8) &$-$0.5 & 2 \\
 & $\longrightarrow$ &  ~H$_2$ +  ~D     &   4.20($-$9) &$-$0.5 & 2 \\
 & $\longrightarrow$ &  ~D  +  ~H  +  ~H  & 4.38($-$8) &$-$0.5 & 2 \\
HD$_2^+$ + e$^-$ & $\longrightarrow$  & ~HD +  ~D      &   4.20($-$9) &$-$0.5\\
 & $\longrightarrow$  & ~D$_2$ +  ~H      &   1.20($-$8) &$-$0.5 \\
 & $\longrightarrow$  & ~D  +  ~D  +  ~H   &   4.38($-$8) &$-$0.5\\
D$_3^+$  + e$^-$ & $\longrightarrow$  & ~D$_2$ +  ~D    &  5.40($-$9)  &$-$0.5 & 3\\
 & $\longrightarrow$  & ~D  +  ~D  +  ~D   & 2.16($-$8)   &$-$0.5 & 3 \\
\hline
\end{tabular}}
\smallskip
Note: $a(-b)$ stands for $a\times 10^{-b}$.  \\
Refs.: 1. McCall et~al.~(\cite{McCall2003}); 2. Sundstr\"{o}m et~al. (\cite{Sundstr1994}); 3.~Larsson et~al.\ (\cite{Larsson1997}).
\end{table}