\begin{table}%t3
\caption{Reaction rates (in cm$^3$/s) for the various processes 
after thermalization in the 
different ISM phases.\label{tab:RR}}
   $$
\begin{array}[b]{lccccc}
\hline
\hline
\mbox{Process/medium} & 
\mbox{Molecular }& 
\mbox{Cold }& 
\mbox{Warm neutral }& 
\mbox{Warm ionized }& 
\mbox{Hot } \\
& \mbox{($T \approx 10$ K)} & \mbox{($T \approx 80$ K)} & \mbox{($T \sim  
8000$ K)} & \mbox{($T \sim  8000$ K)} & \mbox{($T \sim  10^6$ K)} \\
\hline
\noalign{\smallskip}
\mbox{Charge Exchange with H} & -  & -  & \mbox{1.8 $\times$ 10$^{-12}$} & -  & -  \\
\mbox{Charge Exchange with H$_2$} & -  & -  & -  & -  & -  \\
\mbox{Charge Exchange with He} & -  & -  & \mbox{9.0 $\times$ 10$^{-21}$} & \mbox{9.0 $\times$ 10$^{-21}$} & -  \\
\mbox{Direct Annihilation with H} & -  & \mbox{6.5 $\times$ 10$^{-14}$} & \mbox{4.4 $\times$ 10$^{-14}$} & -  & -  \\
\mbox{Direct Annihilation with H$_2$} & \mbox{4.3 $\times$ 10$^{-13}$} & -  & -  & -  & -  \\
\mbox{Direct Annihilation with He} & \mbox{1.5 $\times$ 10$^{-13}$} & \mbox{3.7 $\times$ 10$^{-14}$} & \mbox{2.6 $\times$ 10$^{-14}$} & \mbox{2.6 $\times$ 10$^{-14}$} & -- \\
\mbox{Radiative Combination} & -  & -  & -  & \mbox{1.2 $\times$ 10$^{-12}$} & \mbox{1.3 $\times$ 10$^{-14}$} \\
\mbox{Direct Annihilation with electrons}  \quad & \quad -  \quad & \quad -  \quad & \quad -  \quad & \quad \mbox{1.7 $\times$ 10$^{-13}$} \quad & \quad \mbox{1.8 $\times$ 10$^{-14}$} \quad \\
\mbox{Capture by grains} & \mbox{2.4 $\times$ 10$^{-16}$} & \mbox{6.8 $\times$ 10$^{-16}$} & \mbox{6.5 $\times$ 10$^{-15}$} & \mbox{4.6 $\times$ 10$^{-14}$} & \mbox{2.4 $\times$ 10$^{-13}$} \\
  \hline
\end{array}$$
\end{table}