\begin{table}%t1
%\centering
\par
\caption{Parameters of all known pulsating PG~1159 stars (corresponding to filled dots in
  Fig.~\ref{fig_gteff}), including the new pulsator \pgstar. See text for references.}\label{pulsators}
\begin{tabular}{lrcccc}
      \hline
      \hline
      \noalign{\smallskip}
     & \Teff     &  \logg     & $M $          & Unstable periods & Observed periods \\
Name & (1000~K) & (cm/s$^2$) & ($M_\odot$) & (s)              & (s) \\
      \noalign{\smallskip}
      \hline
      \noalign{\smallskip}
PG~0122+200 &  80 & 7.5 & 0.50 &  202--822  &  336--612 \\
PG~1159-035 & 140 & 7.0 & 0.53 &  483--704  &  430--840 \\
PG~1707+427 &  85 & 7.5 & 0.52 &  200--778  &  336--942 \\
\rxj         & 170 & 6.0 & 0.70 & 1289--2332 &  694--1530 \\
PG~2131+066 &  95 & 7.5 & 0.55 &  191--643  &  339--598 \\
HS~2324+3944& 130 & 6.2 & 0.55 & 1355--3013 & 2005--2569 \\
K1-16        & 140 & 6.4 & 0.50 &  857--2192 & 1500--1700 \\
NGC~246     & 150 & 5.7 & 0.70 & 1160--1466 & 1460--1840 \\
Longmore 4   & 120 & 5.5 & 0.65 &            &  831--2325 \\
\pgstar      & 160 & 6.0 & 0.68 &            & 919 \\
      \hline
\end{tabular}
\end{table}