\begin{table}%t2
\par
  \caption{\label{tab2}Comparison of measured stellar magnitudes.}
  \small%\centering
\par
  \begin{tabular}{lrcc}
  \hline
  \hline\noalign{\smallskip}
  Nebula    &      (1)    &    (2)  &     (3)\\
  \hline
  NGC~2440  &    17.63   &   17.49  &   17.6\\
  NGC~7027  &    16.04   &   16.53  &   16.18\\
  \hline
  \end{tabular} 
\end{table}