\begin{table}%t3
\par
\caption{The optical properties of HBS28.}
\label{summary}
%\centerline
 {\begin{tabular}{c c c c r l l c}
\hline
\hline
name & X-ray position & optical position & id & type & $z$ & mag & id ref \\ 
     &  (J2000) & (J2000) & & & & & \\
                        \hline
XBS~J002618.5+105019 & 00 26 18.50 +10 50 19.3 & 00 26 18.70 +10 50 19.5 &  BEL AGN   & 1 &0.473 & 17.5 &   TNG11/01   \\
XBS~J013240.1--133307 & 01 32 40.11 --13 33 07.8 &  01 32 40.27 --13 33 07.2 & NEL AGN   & 2 & 0.562 & 20.0  & ESO10/02   \\
XBS~J013944.0--674909 & 01 39 44.02 --67 49 09.4 &  01 39 43.77 --67 49 08.4 & BEL AGN  & 1 &0.104 & 16.7 &   ESO10/02   \\
XBS~J014100.6--675328 & 01 41 00.66 --67 53 28.9&  01 41 00.23 --67 53 27.6 & E.L.star & -- & -- & 16.4 &  (a) \\
XBS~J015957.5+003309 & 01 59 57.52 +00 33 09.7&  01 59 57.60 +00 33 10.5 & BEL AGN   & 1 &0.310 & 18.3 &   TNG11/01   \\
XBS~J021640.7--044404 & 02 16 40.74 --04 44 04.9&  02 16 40.66 --04 44 04.7 & BEL AGN   & 1 &0.873 & 16.5 &  TNG11/01   \\
XBS~J021808.3--045845 & 02 18 08.34 --04 58 45.7&  02 18 08.20 --04 58 45.7 & BEL AGN   & 1 &0.712 & 17.7 &  AXIS \\
XBS~J021817.4--045113 & 02 18 17.40 --04 51 13.3 &  02 18 17.43 --04 51 13.0& BEL AGN   & 1 &1.070 & 19.5 &   AXIS \\
XBS~J021822.2--050615 & 02 18 22.28 --05 06 15.7&  02 18 22.15 --05 06 14.5 & NEL AGN   & 2 &0.044 & 14.8 & (b) \\
XBS~J023713.5--522734 & 02 37 13.54 --52 27 34.4&  02 37 13.66 --52 27 34.7 & NLSy1  & 1 &0.193 & 17.1 &  ESO10/02   \\
XBS~J030206.8--000121 & 03 02 06.86 --00 01 21.2&  03 02 06.76 --00 01 21.7 & BEL AGN   & 1 &0.641 & 18.8 &  (c) \\
XBS~J030614.1--284019 & 03 06 14.19 --28 40 19.9&  03 06 14.21 --28 40 19.3 & BEL AGN   & 1 &0.278 & 18.5 &  ESO10/02   \\
XBS~J031015.5--765131 & 03 10 15.56 --76 51 31.5&  03 10 15.88 --76 51 33.8 & BEL AGN   & 1 &1.187 & 17.6 &  (d) \\
XBS~J031146.1--550702 & 03 11 46.12 --55 07 02.5&  03 11 46.18 --55 06 59.9 & Sy1.9  & 2 &0.162 & 17.3 & ESO10/02   \\
XBS~J031859.2--441627 & 03 18 59.29 --44 16 27.6&  03 18 59.41 --44 16 26.7 & BEL AGN  & 1 &0.140 & 15.9 &  (b), ESO10/02   \\
XBS~J033845.7--352253 & 03 38 45.77 --35 22 53.4&  03 38 46.02 --35 22 52.7 & NEL AGN   & 2 &0.113 & 17.0 &  (e) \\
XBS~J040658.8--712457 & 04 06 58.87 --71 24 57.7&  04 06 58.88 --71 24 59.8 & Sy1.9  & 2 &0.181 & 18.7 &  ESO10/02   \\
XBS~J040758.9--712833 & 04 07 58.97 --71 28 33.5&  04 07 58.58 --71 28 32.2 & NEL AGN   & 2 &0.134 & 17.0 & ESO10/02   \\
XBS~J041108.1--711341 & 04 11 08.10 --71 13 41.1&  04 11 08.78 --71 13 42.8 & BEL AGN  & 1 &0.923? & 20.3$^*$ & ESO10/02   \\
XBS~J185613.7--462239 & 18 56 13.75 --46 22 39.2 &  18 56 13.78 --46 22 37.1& BEL AGN   & 1 &0.768 & 19.0 & ESO05/02   \\
XBS~J193248.8--723355 & 19 32 48.80 --72 33 55.2&  19 32 48.77 --72 33 53.3 & ELG  & 2 &0.287 & 18.8 & ESO05/02   \\
XBS~J204043.4--004548 & 20 40 43.46 --00 45 48.2&  20 40 43.46 --00 45 51.9 & NEL AGN   & 2 &0.615 & 21.2$^*$  &  ESO10/02   \\
XBS~J205635.7--044717 & 20 56 35.75 --04 47 17.9&  20 56 35.67 --04 47 17.2 & BEL AGN   & 1 &0.217 & 17.3 & TNG09/02   \\
XBS~J205829.9--423634 & 20 58 29.97 --42 36 35.0&  20 58 29.89 --42 36 34.2 & NLSy1  & 1 &0.232 & 18.3 &  ESO10/02   \\
XBS~J213002.3--153414 & 21 30 02.32 --15 34 14.1&  21 30 02.30 --15 34 13.2 & BEL AGN  & 1 &0.562 & 17.3 &  ESO10/02   \\
XBS~J213824.0--423019 & 21 38 24.03 --42 30 19.2&  21 38 24.03 --42 30 17.5 & BEL AGN   & 1 &0.257 & 16.6 &  (f)   \\
XBS~J214041.4--234720 & 21 40 41.45 --23 47 20.1&  21 40 41.53 --23 47 19.3 & BEL AGN   & 1 &0.490 & 18.4 & ESO10/02   \\
XBS~J220601.5--015346 & 22 06 01.50 --01 53 46.9&  22 06 01.45 --01 53 46.1 & BEL AGN   & 1 &0.211 & 20.1 & ESO10/02   \\
            \hline
\end{tabular}}
\par
Column 1: name;
\par
Col. 2: X-ray position;
\par
Col. 3: optical position;
\par
Col. 4: spectroscopic classification (BEL AGN = Broad Emission Line AGN; NEL AGN = Narrow Emission Line 
AGN; NLSy1 = Narrow Line Seyfert 1; Sy1.9 = Seyfert 1.9; ELG = Emission Line Galaxy);
\par
Col. 5: optical spectral type;
\par
Col. 6: redshift;
\par
Col. 7: APM red magnitude; the asterisk indicates that the magnitude ($R$)
has been derived from our own observations;
\par
Col. 8: reference for the identification i.e. the observing run, if the
source has been identified by us, or a reference, if the source 
has been identified from the literature. The notes are:
\par
(a) V* BL Hyi. See Appendix A.1;
\par
(b) identification from Severgnini et~al. (\cite{Severgnini03});
\par
(c) identification from La Franca et~al. (\cite{La Franca92});
\par
(d) identification from Fiore et~al. (\cite{Fiore00});
\par
(e) identification from Carter \& Malin (\cite{Carter83});
\par
(f) identification from Hewett et~al. (\cite{Hewett95});
\par
AXIS: identification from the AXIS project (Barcons et~al. \cite{Barcons02a}a,b).
%$^*$the measured redshift is based on one line (MgII$\lambda$2798\AA, 
%see appendix for a more detailed description of this source)
\end{table}