\begin{table}%t6
  \caption{\label{T6}Derived activity cycles.}
  %\centerline
{\small
  \begin{tabular}{lrl}
  \hline\hline
  Star & \multicolumn{1}{c}{Rotation period$^a$}   &  \multicolumn{1}{c}{Cycle lengths} \\
       & \multicolumn{1}{c}{(days)}          &  \multicolumn{1}{c}{(years)} \\
  \hline
AB Dor    &  0.515 & 3.3, L \\
LQ Hya    &  1.601 & 2.5, 3.6, 7.0$\rightarrow$12.4 \\
V833 Tau  &  1.788 & 2.2, 5.2, 27-30, L \\
V410 Tau  &  1.872 & 4.1$\leftarrow$5.2, 6.5$\rightarrow$6.8 \\
EI Eri    &  1.947 & 2.9$\leftrightarrow$3.1, 4.1$\leftrightarrow$4.9, 14.0 \\
FK Com    &  2.400 & 4.5$\leftrightarrow$6.1, L \\
V711 Tau  &  2.838 & 3.3, 5.4, 8.8$\leftarrow$17.9 \\
UZ Lib    &  4.768 & 3.1$\leftarrow$4.3, L \\
UX Ari    &  6.437 & 3.6$\leftarrow$4.6, L \\
HU Vir    & 10.388 & 5.7, L \\
IL Hya    & 12.905 & 2.7$\rightarrow$3.0, 4.4, L \\
XX Tri    & 23.969 & 3.8, L \\
HK Lac    & 24.428 & 5.4$\rightarrow$5.9, 10.0$\rightarrow$13.3, L \\
IM Peg    & 24.649 & 9.0, L \\
\hline
HD 131156A &  6.25   & 3.9$\leftarrow$5.5, 11.0 \\	
HD 131156B & 11.1   & 4.3, L \\
HD 100180  & 14.3   & 3.5, 8.6$\leftarrow$13.7 \\
HD 201092  & 35.5   & 4.7, 11.5 \\
HD 201091  & 36.1   & 3.6, 6.2$\leftrightarrow$7.2 \\
HD 95735   & 54.7    & 3.4$\leftrightarrow$3.9, 11.0 \\
  \hline
  \end{tabular}}
\par
  \medskip
The cycle lengths, given in years, are listed in order of increasing value. For changing cycle periods, arrows show the direction of the change between the extreme values, ``L'' denotes multi-decadal variations.\\
$^a$ The orbital period is given in the case of a synchronised binary.
\end{table}