\begin{table}%t2
%\centering
\par
    \caption{\label{tbl:xray}\mbox{X-ray} luminosities for a subset of our
      stellar sample.}
    \begin{tabular}{lccc}
      \hline\hline\noalign{\smallskip}
      Star name & Satellite & $L_{\rm X}$ [erg/s] & Ref. \\
\hline\noalign{\smallskip}
      HM~27 & ROSAT & $<$$6.3 \times 10^{28}$ & \cite{Feigelson1993}  \\
      LkHA~271 & CXO & $1.3 \times 10^{28}$ & \cite{Getman2002}  \\
      Hn~9 & XMM & $1.6 \times 10^{29}$ & \cite{Robrade2007} \\
      TW~Cha & ROSAT & $4.0 \times 10^{29}$ & \cite{Feigelson1993}  \\
      IM~Lup & XMM & $4.2 \times 10^{29}$ & this study \\
      CK4 & CXO & $4.4 \times 10^{29}$ & \cite{Giardino2007} \\
      SSTc2d~J162715.1-245139 & XMM & $4.6 \times 10^{29}$ & \cite{Ozawa2005} \\
      SX~Cha & XMM & $4.7 \times 10^{29}$ & this study \\
      XX~Cha & XMM & $1.0 \times 10^{30}$ & \cite{Robrade2007}  \\
      VZ~Cha & XMM & $1.3 \times 10^{30}$  & \cite{Robrade2007}  \\
      V710~Tau & XMM & $1.4 \times 10^{30}$ & \cite{Gudel2007} \\
      WX~Cha & XMM & $1.5 \times 10^{30}$ & \cite{Stelzer2004} \\
      SR~9 & ROSAT & $2.5 \times 10^{30}$ & \cite{Casanova1995} \\
      RU~Lup & XMM & $3.1 \times 10^{30}$ & this study \\
      C7-11 & XMM & $5.9 \times 10^{30}$ & \cite{Stelzer2004} \\
      Sz96 & XMM & $6.2 \times 10^{30}$ & this study \\
      VW~Cha & XMM & $9.3 \times 10^{30}$ & \cite{Stelzer2004} \\
      \hline
    \end{tabular}
\vspace*{-2mm}
\end{table}