\begin{table}%T6
\caption{The current optical breakdown of the BSS and HBSS\protect samples.}\label{t6}
%\centerline
{
\begin{tabular}{lrr}
\hline
\hline
                     &    BSS$^{1}$          & HBSS         \\
\hline
Objects$^{2}$        &           389  (166)  &          67  \\
\\
Identified:          &           278  (146)  &          60  \\
Identification rate  &           71\% (88\%) &          90\% \\
                     &                       &              \\
AGN-1                &           180  (100)  &          39  \\
AGN-2                &            26  (15)   &          16  \\
Galaxies$^{3}$       &             7  (3)    &           1  \\
Clusters of Galaxies &             4  (1)    &           1  \\
BL Lacs              &             5  (3)    &           1   \\
Stars$^{4}$          &            56  (24)   &           2   \\
\hline
\end{tabular}}
\par
\medskip
$^{1}$ In brackets we have reported the optical breakdown for the BSS~sources with 
Right Ascension below 5$^{\rm h}$ or above 17$^{\rm h}$;
$^{2}$ Note that 56~sources are in common between the BSS and HBSS samples;
$^{3}$ We stress that some of the sources classified as "Optical Normal
Galaxy'' could indeed host an optically elusive~AGN (see e.g. Severgnini et~al.
\cite{Severgnini03});
$^{4}$ To our knowledge all but one (XBS~J014100.6$-$675328)
of the sources classified as stars are coronal emitters.
\end{table}