\begin{table}%t2
\caption{\label{tab2}Summary of measurements.}
\small%\centerline
 {
\begin{tabular}{l|lll|ll|l}
\hline\hline
&&&&&& \\[-8pt]
Burst source & \multicolumn{3}{|c|}{Mean burst duration (s)$^a$} & \multicolumn{2}{|c|}{Tail/prompt ratio}  & Ref.$^b$ \\
        & time scale$^c$ & $\tau_2^d$ & tail$^e$ & in time$^f$ & in fluence$^g$ & \\[2pt]
\hline
\multicolumn{7}{c}{\it Sources discussed here} \\
\hline
GS 1826-24    &$39.4\pm0.2$     & 44.6 & $1252\pm25$         & 32/28 & 0.03 (300 s) & \\
              &                 &      & {\it (600--5500 s)}  &       &              & \\
              &                 &      &$\chi^2/\nu$ = 16.9/15 &       &              & \\
4U 1728-34    & $5.85\pm0.02$   & 12.6 &  $313\pm17$         & 53/25 & 0.09 (100 s)  & \\
              &                 &      &  {\it (200--800 s)}  &       &              & \\
              &                 &      &$\chi^2/\nu$ = 13.4/11 &       &              & \\
EXO 0748-676  & $13.7\pm0.1$    & 36.3 & $300\pm42^h$        & 22/8  & 0.01 (300 s) & \\
              &                 &      & {\it (400--1200 s)}  &       &              & \\
              &                 &      &$\chi^2/\nu$ = 141/44  &       &              & \\
\hline
\multicolumn{7}{c}{\it Literature cases} \\
\hline
GX 3+1        & $3\pm1$         &  6   & 1110 $\pm$ $170$&370/185& 40 (10 s) & 1 \\
M~28           &                 & 7.5  & 800--3250    & $\sim$$100$& $>$$1.4^i$ (90 s)& 2\\
Aql X-1       & $18.4$          &      & $627\pm100$ & 34    &    & 3 \\
OSO-8 long burst& 44.8          &      & 215.7       &  5    & 0.01 (150 s) & 4 \\
\hline
\end{tabular}}
\medskip
$^a$ Averaged over the bursts cataloged by \cite{gal06}; $^b$~references: 1~-- \cite{che06}; 2~-- \cite{got97}; 3~$-$~\cite{cze87}; 4~-- \cite{swa77}; $^c$~the time scale is defined as the burst fluence divided by the peak flux; $^d$~$\tau_2$ is the e-folding decay time of the final part of the prompt burst; $^e$~the time range in parentheses refers to the interval in which the fit was carried out; $^f$~the two numbers refer to division by the mean time scale and~$\tau_2$, respectively; $^g$~fluences for GS~1826-24 and 4U~1728-34 were determined from data averaged over multiple bursts; that for EXO~0748-676 from the RXTE~triple burst. The time between parentheses refers to the interval for the prompt emission; $^h$~this value applies to the triple burst only and excluding times for the second burst; $^i$~based on counts of 0.8$-$12~keV photons in ASCA-GIS \citep[Table~\ref{tab1} in][]{got97}.
\end{table}