\begin{table}%t1
\caption{\label{tab01}Characteristics of the solutions and estimates of $\gamma$.}
%\centering
\par
\begin{tabular}{lccccrc}
\hline
\hline\noalign{\smallskip}
 & No. sessions & No. delays & No. sources & Postfit rms delay & $\gamma$ & $\chi^2/f$ \\
 & & & & (ps) & & \\
\hline
1979--2008 & 3937 & 4~386~112 & 988 & 25.0 & $0.99984 \pm 0.00015$ & 0.86 \\
1984--2008 & 3852 & 4~348~913 & 988 & 24.9 & $0.99986 \pm 0.00015$ & 0.86 \\
1984--2002 & 3040 & 2~857~624 & 781 & 27.0 & $0.99993 \pm 0.00017$ & 0.89 \\
1979--1999 & 2598 & 2~115~509 & 723 & 27.4 & $0.99983 \pm 0.00020$ & 0.91 \\
1996--2002 &   753 & 1~024~322 & 676 & 27.5 & $0.99940 \pm 0.00022$ & 0.83 \\
1994--1997 &   650 &   849~084 & 683 & 24.6 & $0.99968 \pm 0.00024$ & 0.83 \\
1998--2002a &  650 &   953~882 & 643 & 26.3 & $1.00017 \pm 0.00032$ & 0.81 \\
1998--2002b &  595 &   873~827 & 616 & 26.2 & $1.00031 \pm 0.00035$ & 0.82 \\
\hline
\end{tabular}
\end{table}