\begin{table}%t11
%\centering
\par
\caption{Summary of processes predicted to be involved in the formation of 
each molecule.}
\label{tproc}
\small
\begin{tabular}{lll} \hline\hline
Molecule & high mass YSOs & low-mass YSOs \\ \hline
CN     & FUV cavity walls & X-rays \\
       & X-rays &   \\
NO     & X-rays & X-rays  \\
       & FUV cavity walls &   \\
SO$^+$ & FUV cavity walls  & X-rays \\
       & X-rays &  \\
CO$^+$ & FUV cavity walls & inner region X-rays \\ 
       &             & inner region FUV    \\ \hline
\end{tabular}
\end{table}