\begin{table}%t1
\caption{\label{table:1}\label{tab1}Summary of the field positions, filter characteristics and
  exposure times for the narrow-band (on-band) images.} 
\small      
%\centerline
{          
\begin{tabular}{c c c c c c c c c c c c c} 
\hline\hline
& & & \multicolumn{4}{c}{[OIII]} & & \multicolumn{3}{c}{H$\alpha$} \\
 Field & RA(J2000) & Dec (J2000)& $\lambda_{\rm c}$ & {\it FWHM} & Exposure & $S_{\it FWHM}$& & $\lambda_{\rm c}$ & {\it FWHM} & Exposure & $S_{\it FWHM}$\\
       & (hh mm ss)& ($^{\circ}$ $'$ $''$) & ($\AA\ $) & ($\AA\ $) & (s) & (arcsec) & & ($\AA\ $) & ($\AA\ $) & (s) & (arcsec) \\
\hline                    
Core & 12 27 48 & +13 18 46 & 5023 & 80 &24~000 &1.20 &&--     &-- &--    &-- 	\\
FCJ  & 12 30 39 & +12 38 10 & 5027 & 44 &18~000 &1.40 &&--     &-- &--    &-- 	\\
LPC  & 12 25 32 & +12 14 39 & 5027 & 60 &27~000 &1.40 &&--     &-- &--    &-- 	\\
SUBC & 12 25 47 & +12 43 58 & 5021 & 74 &3600  &0.68 && 6607      &101&8728  &0.70   	\\
\hline
LPRX & 12 28 00 & +09 30 00 & 5027 & 60 &27~000 &1.80 &&--     &-- &--    &-- 	\\
LPE  & 12 17 27 & +13 41 30 & 5027 & 60 &27~000 &1.30 &&--     &-- &--    &-- 	\\ 
LPS  & 12 27 34 & +10 43 42 & 5027 & 60 &27~000 &1.30 &&--     &-- &--    &-- 	\\
LSF  & 12 38 33 & +12 08 41 & 5023 & 80 &33~000 &1.08 &&--     &-- &--    &-- 	\\
RCN1 & 12 26 13 & +14 08 03 & 5023 & 80 &24~000 &1.20 && --        &-- &--    &-- 	\\
SUB2 & 12 24 13 & +14 09 01 & 5021 & 74 &3600  &1.00 && 6607      &101&9000  &1.10	\\
SUB3 & 12 24 32 & +15 21 21 & 5021 & 74 &3600  &1.00 && 6607      &101&9000  &1.05	\\
\hline                  
\end{tabular}}
\smallskip
  The fields listed above the horizontal line are located within
80 arcmin of the Virgo cluster center; the data reduction is
described in previous work (FCJ: Arnaboldi et~al. 2002; SUBC:
Arnaboldi et~al. 2003; Core and LPC: Aguerri et~al. 2005). The fields
listed below the horizontal line are at distances between 80 and 215~arcmin of Virgo cluster center.
\end{table}