\begin{table}%t1
%\centering
\par
\caption{Results of fitting a circle to the outer edge of the light echo of
         V838 Mon. Time of observations, $t_{\rm obs}$, 
         is in days since January 1, 2002. Results are in arcsec.\label{echo_obs}}
\begin{tabular}{c c c c}
\hline\hline
\multicolumn{1}{c}{$t_{\rm obs}$(days)} &
\multicolumn{1}{c}{$\theta$} &
\multicolumn{1}{c}{$x$(centre)} &
\multicolumn{1}{c}{$y$(centre)} \\
\hline
 120.0 & $18.55\pm0.76$ & $-0.84\pm1.10$ & $0.46\pm1.06$ \\
 140.0 & $20.89\pm0.71$ & $-1.12\pm1.02$ & $0.51\pm0.98$ \\
 245.0 & $30.32\pm0.92$ & $-2.27\pm1.34$ & $0.37\pm1.27$ \\
 301.0 & $33.68\pm0.95$ & $-2.36\pm1.38$ & $1.11\pm1.31$ \\
 351.0 & $36.66\pm1.01$ & $-2.61\pm1.46$ & $1.58\pm1.37$ \\
\hline
\end{tabular}
\end{table}