\begin{table}%t5
\caption{\label{table:lines}Test lines.}    
%\centering
\small                          
\begin{tabular}{l c c c c c}        
\hline\hline                  
Molecule & $Wavelength$ & $\chi_{\rm exc}$ & $\log gf$ & $W$ & $\log W/\lambda$ \\   
 & [\AA] & [eV] & (cgs) & m\AA\ \\
\hline                         
   CO &  15~580.4 &  0.37 & $-7.44$ &  60 &  $-5.4$\\       
   CN &  15~563.4 &  1.15 & $-1.14$ & 120 & $-5.2$\\
   OH  & 15~568.8  & 0.30 & $-5.29$ &  152 & $-5.0$  \\
   \hline                                    
\end{tabular}
\end{table}