\begin{table}%t4
\caption {\label{tab:PNLTOT3}Number of PNs in the photometric samples, for the M~87 halo and 
the~ICL.} 
%\centerline
 {\begin{tabular}{lccc}
\hline\hline Field & $N_{\rm phot}$ & $N_{\rm phot}$& $N_{\rm phot}$ \\ 
             &            & M~87       & ICL         \\
\hline
FCJ & 16$^a$ & 14 & 2 \\ 
F7  & 24$^b$ & 10 & 14 \\ 
\hline\\
 \end{tabular} }
\par
 \smallskip
$^a$ Number of PNs above the photometric completeness limit from
Aguerri et~al. (2005). $^b$ Number of PNs above the photometric
completeness from Table~\ref{tab:rates} in F7\_1 and F7\_2.
\end{table}