\begin{table}%t5
  \caption{\label{T5}Rotational periods from Ca II index measurements, for the full datasets 
and for three subintervals.}
  %\centerline
{\small
  \begin{tabular}{lr|rrr}
  \hline\hline
  \multicolumn{1}{c}{Star} & \multicolumn{1}{c|}{all data}  & 
\multicolumn{1}{c}{1. part} & \multicolumn{1}{c}{2. part} & 
\multicolumn{1}{c}{3. part} \\
       & \multicolumn{1}{c|}{(days)} & \multicolumn{1}{c}{(days)} & 
\multicolumn{1}{c}{(days)} & \multicolumn{1}{c}{(days)} \\
  \hline
HD 131156A & 6.25   &  \multicolumn{1}{c}{--} & 6.21  & 
6.15 \\	
HD 131156B & 11.1 &  \multicolumn{1}{c}{--}  & 11.2 & 
11.05 \\
HD 100180  & 14.3   &  \multicolumn{1}{c}{--}  & 14.9  & 
\multicolumn{1}{c}{--} \\
HD 201092  & 35.5    &  30.2  & 36.5 & 
35.53\\
HD 201091  & 36.1   &  37.3 & 36.0 & 
38.4 \\
HD 95735   & 54.7    &  \multicolumn{1}{c}{--}  &  54.5  & 
\multicolumn{1}{c}{--} \\
  \hline
  \end{tabular}}
\par
  \medskip
Values outside 3$\sigma$ in different subsets 
indicate differential rotation.
\end{table}