+A table using dcolumn:
+
+\begin{table}
+\begin{tabular}{ccddd}
+One&Two&
+\multicolumn{1}{c}{\textrm{Three}}&
+\multicolumn{1}{c}{\textrm{Four}}&
+\multicolumn{1}{c}{\textrm{Five}}\\
+\hline
+one&two&\mbox{three}&\mbox{four}&\mbox{five}\\
+He&2& 2.77234 & 45672. & 0.69 \\
+C\footnote{Some tables require footnotes.}
+&C\footnote{Some tables need more than one footnote.}
+& 12537.64 & 37.66345 & 86.37 \\
+\end{tabular}
+\end{table}
+
+
+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}
+