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\documentclass[12]{article}
\renewcommand{\rmdefault}{phv}
% Arial font
\renewcommand{\sfdefault}{phv}
% Arial font
\begin{document}
\title{test}
\maketitle
This is a test document
% Table created by StarGazer v.3.0.1 by Marek Hlavac, Harvard University. E-mail: hlavac at fas.harvard.edu
% Date and time: Sat, Feb 02, 2013 - 12:41:40
\begin{table}[htb] \centering
\caption{}
\label{}
\footnotesize
\begin{tabular}{@{\extracolsep{5pt}} c c c }
\\[-1.8ex]\hline
\hline \\[-1.8ex]
variable1 & variable2 & variable3 \\
\hline \\[-1.8ex]
$21$ & $6$ & $160$ \\
$21$ & $6$ & $160$ \\
$22.800$ & $4$ & $108$ \\
\hline \\[-1.8ex]
\normalsize
\end{tabular}
\end{table}
\end{document}