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Hi, trying to modify something, I have found a way to resolve. I post the code if someone are interested.

\begin{center}
\small
\tablefirsthead{%
\hline
\multicolumn{11}{|c|}{SOM performance} \\ \hline
\multicolumn{1}{|c|}{Cluster number} & \multicolumn{1}{c|}{Distance measure} & \multicolumn{3}{c ...

Hi all.
I need to write a table that have this aspect:

____________________________________________________________
| |_______1000________|____10000_______|___20000_______|
| meas. |0.1 | 0.01 | 0.001| 0.1 |0.01|0.001| 0.1|0.01|0.001 ...