+A table using decimal alignment:
+
+\begin{table}
+\begin{tabular}{ccr@{\extracolsep{0pt}.}lr@{\extracolsep{0pt}.}lr@{\extracolsep{0pt}.}l}
+One & Two & \multicolumn{2}{c}{Three} & \multicolumn{2}{c}{Four} & \multicolumn{2}{c}{Five}\tabularnewline
+\hline
+one & two & \multicolumn{2}{c}{three} & \multicolumn{2}{c}{four} & \multicolumn{2}{c}{five}\tabularnewline
+He & 2 & 2&77234 & 45672& & 0&69 \tabularnewline
+C & C & 12537&64 & 37&66345 & 86&37 \tabularnewline
+\end{tabular}
+\end{table}
+
+