LaTeX.org

Hi,

I've made this table using the dcolumn package in the preamble. However, are headlines (i.e. "Size (nm)" and $N_{R6G(mean)}$ ) are not centered above the "±" signs in the table.
\begin{table}[!htb]
\centering
\resizebox{11cm}{!}{
\begin{tabular}{D{,}{\, \pm \,}{-1} D{,}{\, \pm \,}{-1} c D ...