
This is my new code but i have a new pb:
\begin{table}[!h]
\begin{center}
\begin{tabular}{l|p{0.9cm}|p{0.9cm}|p{0.9cm}|p{0.9cm}|p{0.9cm}|p{0.9cm}|p{0.9cm}|p{0.9cm}|p{0.9cm}|p{0.9cm}|}
\cline{2-11}
&\multicolumn{2}{|p{2.5cm}|} {\bf 100 Pages }& \multicolumn{2}{|p{2.5cm}|} {\bf 250 Pages }& \multicolumn{2}{|p{2.5cm}|} {\bf 500 Pages }& \multicolumn{2}{|p{2.5cm}|} {\bf 750 Pages }& \multicolumn{2}{|p{2.5cm}|} {\bf 1000 Pages }\\
\cline{2-11}
&\bf R1& \bf R2& \bf R3& \bf R4& \bf R5& \bf R6& \bf R7& \bf R8& \bf R9& \bf R10\\
\hline
Nb Pages Publiques &\bf R1& \bf R2& \bf R3& \bf R4& \bf R5& \bf R6& \bf R7& \bf R8& \bf R9& \bf R10\\
\hline
Nb Pages Amis \\et leurs Amis &\bf R1& \bf R2& \bf R3& \bf R4& \bf R5& \bf R6& \bf R7& \bf R8& \bf R9& \bf R10\\
\hline
Text&\bf R1& \bf R2& \bf R3& \bf R4& \bf R5& \bf R6& \bf R7& \bf R8& \bf R9& \bf R10\\
\hline
\end{tabular}
\end{center}
\bf{\caption{Caractéristiques du Réseau 1}}
\end{table}
When I put Nb pages Amis\\ et leurs Amis a line empty is inserted and I want to eliminate this please

\centeringnot\centerinsidetable: Should I use center or centering for figures/tables?, but you seem to like to use a non-floating table anyway: How to influence the position of float environments like figure and table in LaTeX?. Finally don't use\bfbut\bfseries: Does it matter if I use\textitor\it(also counts for\bf). – Martin Scharrer May 07 '12 at 15:54