\begin{table}%t1
%\centering
\par
\caption{Photospheric parameters of the sample stars.\label{table1}}
$$
\begin{tabular}{lr@{$~\pm~$}lr@{$~\pm~$}l}%{lr@{$\pm$}lr@{$\pm$}l}
\hline\hline
 & \multicolumn{2}{c}{V652~Her~($R_{\rm max}$)} & \multicolumn{2}{c}{HD~144941}\\
\hline
$T_{\rm eff}$~(K)                  & 22~000 & 500               & 22~000 & 1~000\\
$\log g$~(cgs)                     &    3.20 & 0.10              & 4.15    & 0.10\\
$\xi$~(km~s$^{-1}$)               &       4 & 1                 & 8       & 2\\
$n_{\rm H}^{\rm NLTE}$~(by number) &   0.005 & 0.0005            & 0.035   & 0.005\\
%$Z$                                 &   \multicolumn{2}{c}{solar} & \multicolumn{2}{c}{0.03$\times$solar}\\
\hline
\end{tabular}
$$
\end{table}