\begin{table}%T1
\caption{\label{tab1}The results of the Kolmogorov-Smirnov tests for the three
subclasses. The first column denotes the subclass; the second the
number of~GRBs of this subclass; the third column gives the
difference~$D$ between the theoretical and empirical cumulative
function; the fourth column gives the significance (in percentage)
of the rejection of the null-hypothesis of isotropy (Eq.~(14.3.9) of
Press et~al. \cite{pre}).}
%\centering
\par
  \begin{tabular}{rrrr}
 \hline \hline\noalign{\smallskip}
  {\it subgroup} & $N$ & $D$ & \% \\
\noalign{\smallskip}\hline\noalign{\smallskip}
  {\it short }& 497       & 0.049 &  82.1     \\
  {\it intermediate} & 301  &  0.054 & 76.5    \\
  {\it long }& 1239  &  0.046 & 99.0    \\
  {\it non-short }& 1540 & 0.021 & 51.2 \\
 {\it  all }     & 2702 & 0.021 & 77.2 \\
  \noalign{\smallskip} \hline 
  \end{tabular}
  \end{table}