\begin{table}%T5
%%\centering
\par
\caption{Variability on longer time scale: here we use multiple ROSAT observations of dF7-dK2 Pleiades stars separed by at least 0.5
months.}
\begin{tabular}{lcccc}
\hline\hline
\multicolumn{1}{c}{Name}&\multicolumn{1}{c}{$<L_x>$
}&\multicolumn{1}{c}
{$\frac{\Delta L}{\delta L}$}&\multicolumn{1}{c}{Elapsed time}&\multicolumn{1}{c}{Time}\\
 &\multicolumn{1}{c}{range}&\multicolumn{1}{c}{on
medium-time} &\multicolumn{1}{c}{of each obs.} &\multicolumn{1}{c}{between obs.} \\
 &\multicolumn{1}{c}{[erg/s]}&\multicolumn{1}{c}{scale} &\multicolumn{1}{c}{[hours]} &\multicolumn{1}{c}{[months]}\\
\hline
HII-253& 29.87--30.11  & 4.44 &1.16--3.62 & 12 \\
HII-708& 29.63--28.82  & 6.02 &1.18--4.51 & 12\\
HII-727& 29.75--29.83 & $<$2  &1.35--4.14 &12     \\
HII-738& 29.58--29.70  &$<$2 &1.29--6.54 &12     \\
HII-761&  29.62--29.73 &$<$2 &5.09--5.15 &0.5  \\
HII-1032 & 29.96--29.99&$<$2& 1.48--4.91&12    \\
HII-1124 & 29.29--29.30  &$<$2& 1.80--6.95 &12\\
HII-1136 & 29.54--29.78& 3.49& 1.19--6.06 &12     \\
HII-1207 & 28.97--29.47&6.50 &4.12--5.00  &0.5  \\
HII-1726 & 29.23--29.46 &2.67 & 1.18--4.84  &12     \\
HII-1856 & 29.18--29.43  &3.63& 2.74--5.83  &6     \\
\hline
\end{tabular}
\label{LtimG}
\end{table}