\begin{table}%t2
{%\centering
\par
\caption{\label{tab:xrayparams}X-ray parameters of the Z~CMa binary and its jet.}
\begin{tabular}{lcrrrr}
\hline\hline\\[-3.2mm]
\multicolumn{1}{c}{Date} & \multicolumn{1}{c}{Opt/IR} & \multicolumn{1}{c}{Offax}       & \multicolumn{1}{c}{Counts}           & \multicolumn{1}{c}{Expo$^*$}  & \multicolumn{1}{c}{$P_{\rm KS}$} \\
                         &                            & \multicolumn{1}{c}{[$^\prime$]} & \multicolumn{1}{c}{in $0.3{-}8$~keV}  & \multicolumn{1}{c}{[s]} &                \\ \hline
Dec. 2003 & Z~CMa & $  1.95 $ & $   47.6 \pm    6.9$ & $  17857.$ &    $  0.54$ \\
Dec. 2003 & jet    & $  1.91 $ & $   {<}9.4$            & $  17857.$ &    $  -   $ \\
\hline
Dec. 2008 & Z~CMa & $  0.30 $ & $  107.2 \pm   10.4$ & $  39594.$ &    $  0.50$ \\
Dec. 2008 & jet    & $  0.34 $ & $   20.7 \pm    4.6$ & $  39610.$ &    $  0.32$ \\
\hline
\end{tabular}}
\par
\medskip{$^*$ The effective exposure time in the 2003 Dec. observation is substantially reduced with respect to the duration of the observation because the star is near a chip border.}
\end{table}