\begin{table}%t1
\caption{\label{table:gamma}Parameters\tablefootmark{a} for SPIRE $\Gamma(k)$ at 250, 350, 500~$\mu {\rm m}$.}
%\centering
\par
\begin{tabular}{l l l l l}
\hline\hline \noalign{\smallskip}
$a_0$ &$a_1$ &  $a_2$ & $a_3$ & $a_4$ \\ 
\hline
0.789137 & $-0.466966$ & --0.070793 & 0.349304 & $-0.068133$ \\
0.671082 & $-0.807737$ &  0.294573 & 0.250785 & $-0.125454$ \\
0.402564 & $-0.897627$ &  0.095114 & 1.785801 & $-0.720592$ \\
\hline          
\end{tabular}
\tablefoot {\tablefoottext{a}{$\Gamma(k) = [1 + \sum_{i=1,4} a_i k^i ] \times \exp[-k^2/(2 a_0^2)]$.}}
\end{table}