\begin{table}%t2
\caption{\label{tab3}Properties of the X-ray observations discussed in this paper.
Exposure times ($T_{\exp}$) and Count Rates ($CR$) refer to the pn
in the 0.5--10~keV band (unless otherwise specified).
$\tau$ is the count rate threshold applied in the determination
of the Good Time Interval for scientific product extraction (details in
text). $\rho$ is the radius of the scientific products extraction
region. $N_{\rm H,~Gal}$ is the column density due to gas in the Milky Way
along the line-of-sight to the GPS galaxy \citep{kalberla05}
in units of $10^{20}$~cm$^{-2}$.}
\par
%\centerline
{\small
\begin{tabular}{lccccc} \hline \hline
Source             & $N_{\rm H,~Gal}$ & $T_{\exp}$ & $\tau$ & $\rho$ & $CR$ \\
& & (ks) & (s$^{-1}$) & (\arcsec) & (10$^{-3}$~s$^{-1}$) \\ \hline
4C+00.02        & 2.7 & 22.2 & 2.1        & ...            & $^a$ \\
PKS0428+20      & 19.6 & 15.4 & 0.75       & 23             & $7.1 \pm 0.8$ \\
4C+14.41        & 2.0 & 16.3 & 0.5        & 15             & $4.8 \pm 0.8$ \\
4C+32.44        & 1.2 & 20.5 & 0.5        & 16             & $25.6 \pm 1.2$ \\
PKS1607+26      & 3.8 & 18.5 & 18         & 20             & $39  \pm 7 $ \\
PKS2008$-$068     & 5.0 & 23.2 & 0.75       & 15             & $2.0 \pm 0.4$ \\
PKS2127+04      & 5.0 & 10.8 & 0.5        & 25             & $21.2  \pm 1.9 $ \\
\hline
\end{tabular}}
\par
\medskip
$^a$~Detected only in the soft X-ray band (0.5--2~keV), with
a count rate: $(2.3 \pm 0.7) \times 10^{-3}$~s$^{-1}$. 
\end{table}