\begin{table}%t2
\caption{Number of sources as a function of the optical (type~1 or
type~2) and the X-ray (type~I or type~II) classifications.}\label{tableagn}
%\centering
\small
\begin{tabular}{cccc}
\hline \hline
   & Type I & Type II & $N$ \\
  \hline
  \textbf{Type 1} & 54 & 7 & 61 \\
  \textbf{Type 2} & 25 & 13 & 38 \\ 
  \hline
    N & 79  &  20 & \textbf{99} \\
    \hline
\end{tabular}
\end{table}