\begin{figure}[!t]
\begin{center}
\begin{tabular}{|c|c|r|r|}\cline{3-4}
 \multicolumn{2}{c}{~}& \multicolumn{2}{|c|}{Improvement}\\\hline
dataset&query $q$&median&spread\\\hline
coc81&ground&95\%&83\%\\
coc81&osp&82\%&68\%\\
nasa93&ground&77\%&15\%\\
ISBSG&stdalone&69\%&100\%\\
nasa93&flight&61\%&73\%\\
nasa93&osp&49\%&48\%\\
maxwell&&44\%&76\%\\
ISBSG&clientsrv&42\%&88\%\\
desharnais&mngr-l&36\%&\cellcolor[rgb]{0.8,0.8,0.8}-45\%\\
coc81&osp2&31\%&71\%\\
nasa93&osp2&27\%&42\%\\
desharnais&mngr-s&23\%&85\%\\
desharnais&mngr-m&23\%&85\%\\
coc81&flight&0\%&18\%\\
desharnais&team-m&0\%&60\%\\
desharnais&team-s&\cellcolor[rgb]{0.8,0.8,0.8}-11\%&\cellcolor[rgb]{0.8,0.8,0.8}-206\%\\
desharnais&team-l&\cellcolor[rgb]{0.8,0.8,0.8}-15\%&\cellcolor[rgb]{0.8,0.8,0.8}-93\%
\\\hline
\multicolumn{2}{r|}{median} & 36\% & 68\% \\\cline{3-4}
\end{tabular}
\end{center}
\caption{Improvements ($100*\frac{initial-final}{intial}$)
for 13 queries. Sorted by median improvement. Gray cells show negative improvements.}
\label{fig:tsize}
\end{figure}
