\begin{table}%t8
\caption{\label{c2h6_c2h2_tab}Abundance ratio of ethane relative
to acetylene derived in this work and for some comets \citep{2001Icar..153.162}.}
%\centering
\par
\begin{tabular}{lc}
\hline
\hline
Comet & $Q$(\CH26)/$Q$(\CH22)  \\
\hline {\bf Hale-Bopp (this work)} & {\bf 2.3 $\pm$ 1.0} \\[1ex]
Hale-Bopp   & 2.4 $\pm$ 0.7 \\
C/1996 B2   & $\sim$0.5$-$4 \\
Hyakutake   & 4 $\pm$ 2 \\
Lee     & 2.6 $\pm$ 0.3 \\
C/1999 S4 Linear & $>$0.9 \\
\hline
\end{tabular}
\end{table}