
\documentclass[border=5pt,multi=true]{standalone}
\usepackage{standalone}
\usepackage{times}
\usepackage{xspace}
\usepackage{array}
\usepackage{graphicx}
\usepackage{amsmath}
\usepackage{upgreek}
\usepackage{cite}

\begin{document}
 
 \vskip 1mm
\begin{tabular}{ lcc }
                   	    & \boldmath$x$     & \boldmath$y$ \\\hline   
Factor $A$ (mm)    	    & $0.215 \,\pm\, 0.020$    & $0.202 \,\pm\, 0.018$ \\
Power $B$          	    & $1.023 \,\pm\, 0.054$    & $1.008 \,\pm\, 0.053$ \\
Constant $C$ ($10^{-3}$~mm)  & $5.463 \,\pm\, 0.675$    & $4.875 \,\pm\, 0.645$ \\
\end{tabular}
\end{document}
