\begin{table}%T1
\caption{Atmospheric parameters of PG~1325+101 derived from 
spectroscopy.\label{cap:spectro}}
%\centerline
{\small
\begin{tabular}{llll}
\hline\hline
 Source & $T_{\rm eff}$ (K) & $\log g$ & $\log N($He$)/N($H$)$ \\
\hline
Telting \& {\O}stensen (2004) & 34~800 $\pm$ 390 & $5.81 \pm 0.05$ & $-1.65 \pm 0.02$ \\
This work (PB6)  & 34~890 $\pm$ 525 & $5.84 \pm 0.09$ & $-1.74 \pm 0.07$ \\
This work (BG9)  & 35~090 $\pm$ 450 & $5.81 \pm 0.08$ & $-1.71 \pm 0.05$ \\
This work (MMT1) & 35~420 $\pm$ 390 & $5.78 \pm 0.05$ & $-1.68 \pm 0.02$ \\
\hline
Mean$^{\dag}$    & 35~050 $\pm$ 220$^{\ddag}$ & $5.81 \pm
0.04$$^{\ddag}$ & $-1.70 \pm 0.02$$^{\ddag}$ \\
\hline
\end{tabular}}
\smallskip
 $^{\dag}$ Reference values used
for the asteroseismic analysis.
$^{\ddag}$ The given error is the quadratic
combination of the uncertainties of each measurement.
\end{table}