\begin{table}%t4
%\centering
\par
% \fontsize{8} {10pt}\selectfont
% \tabcolsep 0.25truecm
 \caption{NGC~1901 additional probable members (PM in the last coulumn,
 or not : PNM.\label{tab4}}
\small \begin{tabular}{cccccccccc}
 \hline \hline
 \multicolumn{1}{c}{ID}         &
 \multicolumn{1}{c}{$\alpha$} &
 \multicolumn{1}{c}{$\delta$}        &
 \multicolumn{1}{c}{$U$}       &
 \multicolumn{1}{c}{$B$}       &
 \multicolumn{1}{c}{$V$}       &
 \multicolumn{1}{c}{$I$}       &
 \multicolumn{1}{c}{$\mu_{\alpha}$}       &
 \multicolumn{1}{c}{$\mu_{\delta}$}       &
 \multicolumn{1}{c}{Membership} \\
 \hline
 & hh:mm:s & $\circ$:$\prime$:$\prime\prime$& mag & mag & mag& mag&
~mas/yr &~mas/yr& \\
\hline
 34& 05:17:05.811&  --68:36:13.94&     14.38&   14.06&  13.26&  12.47&   19.8~$\pm$~6.4&      --3.7~$\pm$~6.1&PNM\\
 38& 05:17:51.366&  --68:26:08.28&     14.75&   14.40&  13.59&  12.69&    3.7~$\pm$~5.9&      21.3~$\pm$~5.9&PM\\
 65& 05:17:56.494&  --68:24:22.36&     15.54&   15.03&  14.12&  13.19&    7.4~$\pm$~5.9&      --8.8~$\pm$~5.9&PNM\\
 70& 05:20:02.775&  --68:24:43.23&     16.06&   15.36&  14.40&  13.36&    8.2~$\pm$~5.9&      23.4~$\pm$~5.9&PNM\\
 93& 05:17:07.433&  --68:34:40.54&     16.48&   15.77&  14.76&  13.64&   --2.0~$\pm$~6.4&      --9.2~$\pm$~6.3&PNM\\
354& 05:19:51.456&  --68:23:01.67&     18.57&   17.40&  16.14&  14.71&   --5.2~$\pm$~5.9&      29.2~$\pm$~5.9&PNM\\
362& 05:17:00.535&  --68:34:57.37&     18.68&   17.30&  16.05&  14.75&   10.8~$\pm$~5.9&       4.0~$\pm$~7.1&PNM\\
 \hline
 \end{tabular}
\end{table}