\begin{table}%t1
%\centering
\par
\caption{Atmospheric parameters derived from independent UV~\mbox{spectra}.\label{tabnew}}
$$
\begin{tabular} {cr@{$\;\pm\;$}lr@{$\;\pm\;$}lr@{$\;\pm\;$}l}
\hline\hline
Instrument & \multicolumn{2}{c}{$T_{{\rm eff}}$ (K)} & \multicolumn{2}{c}{$\log g$}
 & \multicolumn{2}{c}{$d$ (pc)} \\ \hline
FOS & 23~900& 1100 & 7.92&0.44 & 42.7&4.3\\
STIS & 24~200&500 & 7.89&0.50 & 43.3&5.7\\ \hline
IUE & 24~000&800 & 7.91&0.43 & 42.3&3.8\\ \hline
\end{tabular}                                                 
$$
\end{table}