\begin{table}%t5
\caption{\label{crsLymanAlpha}References for cross sections for production of Lyman $\alpha$ photons by electronic collision and photoexcitation.}
\small%\centering
\par
\begin{tabular}[h]{ll}
\hline \hline 	 
Process	& References 						\\
\hline
\multicolumn{2}{l}{Electron collisions:} \\ 
H(1s) $\rightarrow$ H(2s)				& \citet{Janev87} \\
H(1s) $\rightarrow$ H(2p) 			& \citet{James97} 	\\
H$_2$ $\rightarrow$ Lyman $\alpha$	& \citet{Ajello91} \\
CH$_4$ $\rightarrow$ Lyman $\alpha$	& \citet{Pang87}\\
\hline
\multicolumn{2}{l}{Photoexcitation:} \\ 
H$_2$ $\rightarrow$ Lyman $\alpha$ 	& \citet{Bozek06} \\
CH$_4$ $\rightarrow$ Lyman $\alpha$	& \citet{Wu81}, \\							& \citet{Fukuzawa05} \\
\hline
\end{tabular} 
\end{table}