\begin{table}%t2
\caption{Image and lens positions.}     
\label{pos.tab}
%\centering
\par
\begin{tabular}{lrr}
\hline
\hline
Object & $\theta_x$ \hspace{0.7cm} & $\theta_y$ \hspace*{0.7cm}\\
\hline
Lens & $0\farcs000 \pm 0\farcs002$ & $0\farcs000 \pm 0\farcs002$ \\
A & $0\farcs750 \pm 0\farcs001$ & $0\farcs459 \pm 0\farcs001$ \\
B & $-0\farcs142 \pm 0\farcs001$ & $-0\farcs169 \pm 0\farcs001$ \\
\hline
\end{tabular}
\end{table}