\begin{table}%t2
%\centering
\par
\caption{Results of fitting a circle centred on the star to the north-west 
         quadrant ($x>0,~y>0$) of the outer edge of the light echo of
         \object{V838~Mon}. Time of observations, $t_{\rm obs}$, 
         is in days since January 1, 2002. Results are in arcsec.\label{echo_nw}}
\begin{tabular}{c c}
\hline\hline
\multicolumn{1}{c}{$t_{\rm obs}$(days)} &
\multicolumn{1}{c}{$\theta$} \\
\hline
  120.0 & $18.46\pm0.32$ \\
  140.0 & $20.59\pm0.19$ \\
  245.0 & $28.83\pm0.36$ \\
  301.0 & $32.83\pm0.44$ \\
  351.0 & $36.02\pm0.45$ \\
\hline
\end{tabular}
\end{table}