\begin{table}%[b]%ta5 
\caption{\label{tab:reacc}List of reactions for the carbon chemistry.}
\par
 {
%%\centerline

{\small\begin{tabular}{@{}l l l l}
\hline
\hline
& Reaction & & Reaction\\
\hline
C1 & C$^+$ + H$^-$ $\rightarrow$ H + C & C2 & ${\rm He^+ + C \rightarrow C^+ + He}$\\
C3 & ${\rm H^+ + C^- \rightarrow C + H}$ & C4 & ${\rm He^+ + C^- \rightarrow C + He}$\\
C5 & ${\rm C^+ + C^- \rightarrow C + C}$ & C6 & ${\rm C + e^- \rightarrow C^- + \gamma}$\\
C7 & ${\rm C^- + \gamma \rightarrow C + e^-}$ & C8 & ${\rm C^+ + H \rightarrow C + H^+}$\\
C9 & ${\rm C + H^+ \rightarrow C^+ + H}$ & C10 & ${\rm H + CH \rightarrow C + H_2}$\\
C11 & ${\rm H + CH \rightarrow C + H + H}$ & C12 & ${\rm C + H_2 \rightarrow CH + H}$\\
C13 & ${\rm H_2 + CH \rightarrow C + H + H_2}$ & C14 & ${\rm C^+ + H_2 \rightarrow CH^+ + H}$\\
C15 & ${\rm C + H \rightarrow CH + \gamma}$ & C16 & ${\rm H^+ + CH \rightarrow CH^+ + H}$\\
C17 & ${\rm H^- + C \rightarrow CH + e^-}$ & C18 & ${\rm H_2^+ + C \rightarrow CH^+ + H}$\\
C19 & ${\rm H_2^+ + CH \rightarrow CH^+ + H_2}$ & C20 & ${\rm H_3^+ + C \rightarrow CH^+ + H_2}$\\
C21 & ${\rm He^+ + CH \rightarrow C^+ + H + He}$ & C22 & ${\rm He^+ + CH \rightarrow CH^+ + He}$\\
C23 & ${\rm C^+ + H \rightarrow CH^+ + \gamma}$ & C24 & ${\rm C^+ + CH \rightarrow CH^+ + C}$\\
C25 & ${\rm CH^+ + H \rightarrow C^+ + H_2}$ & C26 & ${\rm CH^+ + e^- \rightarrow C + H}$\\
C27 & ${\rm H + C^- \rightarrow CH + e^-}$ & C28 & ${\rm H + CH_2 \rightarrow CH + H_2}$\\
C29 & H$_2$ + CH $\rightarrow$ CH$_2$ + H & C30 & ${\rm H^+ + CH_2 \rightarrow CH^+ + H_2}$\\
C31 & ${\rm H + CH_2^+ \rightarrow CH^+ + H_2}$ & C32 & ${\rm H_2^+ + CH \rightarrow CH_2^+ + H}$\\
C33 & ${\rm H_2 + CH^+ \rightarrow CH_2^+ + H}$ & C34 & ${\rm H_3^+ + CH \rightarrow CH_2^+ + H_2}$\\
C35 & ${\rm He^+ + CH_2 \rightarrow C^+ + He + H_2}$ & C36 & ${\rm He^+ + CH_2 \rightarrow CH^+ + He + H}$\\
C37 & ${\rm H^+ + CH_2 \rightarrow CH_2^+ + H}$ & C38 & ${\rm C + CH_2 \rightarrow CH + CH}$\\
C39 & ${\rm H_2^+ + CH_2 \rightarrow CH_2^+ + H_2}$ & C40 & ${\rm C^+ + CH_2 \rightarrow CH_2^+ + C}$\\
C41 & ${\rm CH_2^+ + e^- \rightarrow CH + H}$ & C42 & ${\rm CH_2^+ + e^- \rightarrow C + H + H}$\\
C43 & ${\rm CH_2^+ + e^- \rightarrow C + H_2}$ & C44 & ${\rm H^- + CH \rightarrow CH_2 + e^-}$\\
C45 & ${\rm H_2 + C^- \rightarrow CH_2 + e^-}$ & C46 & ${\rm H_2 + C \rightarrow CH_2 + \gamma}$\\
C47 & ${\rm H_2 + C^+ \rightarrow CH_2^+ + \gamma}$ & C48 & ${\rm C^+ + e^- \rightarrow C + \gamma}$\\
C49 & ${\rm C + \gamma \rightarrow C^+ + e^-}$ & &\\
\hline
\end{tabular}}}
\end{table}