\begin{table}%T2
%\centering
\par
\caption{\label{table_allperiodograms}Summary of possible periodicities.}
\begin{tabular}{lll}
\hline
\hline\noalign{\smallskip}
Object & Periodicity (min) & Remarks\\   
\hline\noalign{\smallskip}
\object{DM Gem}   & 177.1, 22.6 & Strong \hel{ii}{4686}. Magnetic? \\
\object{CP Lac}   & 182.9       & Shallow eclipses? SW Sex? \\
\object{GI Mon}   & 259.2       & \\
\object{V400 Per} & 219 or 258  & \\
\object{CT Ser}   & 233.3       & \\
\object{XX Tau}   & 7200, 195.8, 23.7 & Disc precession? \\
\noalign{\smallskip}\hline
\end{tabular}
\end{table}