\begin{table}%T1
\caption{\label{tab1}Targets: basic properties.}
%\centerline
{
\begin{tabular}{lccccccc}
\hline\hline
\noalign{\smallskip}
Object Name  & RA        &  Dec        & $z$ & $N_{\rm H,Gal}$ & Type & $L_{2-10~{\rm keV}}$&Ref.\\
~~~~~~~(1)    & (2)         &  (3)         &(4)&     (5)         & (6)  &     (7)             &(8) \\
\noalign{\smallskip}
\hline
\noalign{\smallskip}
PKS 0548--322 & 05 50 40.80 & --32 16 17.80 & 0.069 & 2.52  & HBL & 31.9 & KU98\\ 
3C 371       & 18 06 50.60 & +69 49 28.10 & 0.051 & 4.73  & LBL &  1.5 & DO01\\  
PKS 2005--489 & 20 09 25.40 & --48 49 54.00 & 0.071 & 5.08  & HBL & 62.2 & PA01\\ 
BL Lac       & 22 02 43.30 & +42 16 39.80 & 0.069 & 21.6  & LBL &  6.1 & RA02\\  
1ES 2321+419 & 23 23 52.10 & +42 10 59.00 & 0.059 & 10.9  & HBL &  1.5 & PE96\\  
1ES 2344+514 & 23 47 04.80 & +51 42 17.40 & 0.044 & 16.8  & HBL &  3.9 & DO01\\  
\hline
\end{tabular}}
\smallskip
{Columns}: $\rm (1)=Source$ name; $\rm (2)=Right$ Ascension at~J2000; $\rm (3)=Declination$ at~J2000; $\rm (4) =Redshift$; $\rm (5)=Galactic$ column density in units of~$10^{20}~{\rm cm^{-2}}$. The Galactic values was derived from the nh program at
HEASARC (based on Dickey \& Lockman \cite{Dickey1990}); $\rm (6)=Source$ type: $\rm HBL=High$--Energy Peaked BL~Lacertae object, $\rm LBL=Low$--Energy Peaked BL~Lacertae object; $\rm (7)=Intrinsic$ X-ray luminosity (in units of~$10^{43}$~erg~s$^{-1}$) between~2 and~10~keV from data in literature; $\rm (8)=Reference$ for the X-ray luminosity: $\rm KU98=Kubo$ et~al. (\cite{Kubo1998}); $\rm DO01=Donato$ et~al. (\cite{Donato2001}); $\rm PA01=Padovani$ et~al. (\cite{Padovani2001}); $\rm RA02=Ravasio$ et~al. (\cite{Ravasio2002}); $\rm PE96=Perlman$ et~al. (\cite{Perlman1996}).
\end{table}