\begin{table}%t4
\caption{Flux measurements of the  pulsar optical counterparts (see 
 Sect.~2.3 for details).\label{t:fluxes}}
%\centerline
{
\begin{tabular}{lcccccclll}
\hline\hline
\multicolumn{1}{c}{Object} &Band   &Seeing$^a$  &$S/N$& $d^b$&Source$^c$ &  $k/\!\cos~(Z)^d$ & $\delta_{\rm fin}d^e$& Mag$^f$     & Flux   \\
	      & &pix &           & pix    & --2.5~Log~(counts/s)  &  mag  & mag&   & $\mu$Jy \\
\hline
PSR B0656+14 &$B$& 4.5 & 22  &    4 &  --1.68   & 0.25    &     1.12       & 25.27(7)  &  0.313(20)  \\
             &$R$& 3.4 & 18  &    4 &  --2.50   & 0.07    &     0.89       & 24.65(8)  & 0.417(30)           \\
	     &$I$&4.1  & 11  &    4 &  --1.90   & 0.05    &     0.95       & 24.52(13) &   0.371(42)\\
\hline
Geminga&$R$&3.7 & 15  &     4  &--1.63   & 0.14  & 0.84   & 25.53(11) & 0.185(17) \\
              &$I$&3.9 & 10  &     4  &--1.37   & 0.05  & 0.87   & 25.10(14) & 0.217(26) \\
\hline
\end{tabular}
}
\par
\smallskip
$^a$~FWHM of the stellar profile in the combined images.   \hspace*{4cm}  $^d$~Corrections for the atmospheric extinction. \\
$^b$~Diameter of the optimal photometrical aperture. \hspace*{4.7cm} $^e$~Correction factors for the PSF.  \\
$^c$~Instrumental magnitudes, $m = {\rm Source} -  k/\cos(Z)  -\delta_{\rm fin}d$. \hspace*{3.5cm} $^f$~Johnson-Cousins  magnitudes. 
\par
\end{table}