\begin{table}%tA.1

%\centering
\par
\caption{Evolution during the decay phase for the 7~May 1993 flare.}\label{t2}
%\centering
\par
\begin{tabular}{c c c c}
\hline\hline\noalign{\smallskip}
Time period  [UT] & $\zeta_{\rm obs}$ & $0.5 \frac{{\rm d}\!\lg L}{{\rm d}\!\lg N}$ & $\zeta_{\rm QSS}$ \\ \hline
\multicolumn{4}{c}{kernel A} \\
22:24--22:40 & $0.16$ & $-0.07$ & $0.43$ \\
\hline
\multicolumn{4}{c}{kernel B} \\
22:40--23:19 & $0.25$ & $-0.07$ & $0.43$ \\
00:03--00:57 & $0.01$ & $-0.00$ & $0.50$ \\
\hline
\multicolumn{4}{c}{kernel C} \\
22:24--22:40 & $0.03$ & $-0.21$ & $0.29$ \\
22:40--23:19 & $0.11$ & $-0.07$ & $0.43$ \\
\hline
\multicolumn{4}{c}{kernel D} \\
00:03--00:57 & $0.04$ & $-0.00$ & $0.50$ \\
\hline
\end{tabular}
\end{table}