
\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}{lcccc}
  & {\bf Scan}& \boldmath $\Delta_x$ \xspace \ {\bf scan} & \boldmath $\Delta_y$ \xspace \ {\bf scan} \\
  \hline
  Mean ( $\upmu \mbox{m}$ \xspace) &$1$& 1.3 & 3.1 \\
                 &$2$& 2.8 & 9.2 \\
  RMS ( $\upmu \mbox{m}$ \xspace)  &$1$& 80.6 & 80.8 \\
  &$2$& 80.5 & 80.7 \\
 \end{tabular}
\end{document}
