\begin{table}%t5
%\centering
\par
\caption{Critical value of $\alpha$ for damping of the fundamental mode 
as a function of the Mach number and~$\chi$, the ratio of the temperature
of the CDL to the pre-shock temperature. This table is an extension of
Table~\ref{tab:fund_damp} where $\alpha_{\rm cr}$ is listed for $\chi=1$.\label{tab:alpha_cr_chi}}
\begin{tabular}{l|rrrr}%{l|llll}
\hline\hline
$M$ & \multicolumn{4}{c}{$\chi$} \\
    & 1.0 & 0.5 & 0.1 & 0.01 \\   
\hline
 1.40 & --1.8 & --0.6 & --0.2 & --0.1 \\
 2.00 & --1.2 & --0.6 & --0.2 & --0.1 \\
 3.00 & --0.7 & --0.5 & --0.2 & --0.1 \\
 5.00 & --0.4 & --0.3 & --0.1 & --0.1 \\
10.0  & --0.1 & --0.1 &  0.1 &  0.3 \\
20.0  &  0.2 &  0.2 &  0.2 &  0.3 \\
40.0  &  0.3 &  0.3 &  0.3 &  0.3 \\
100   &  0.4 &  0.4 &  0.4 &  0.4 \\ 
\hline
\end{tabular}
\end{table}