\begin{table}%t2
\caption{\label{tab2}Distribution of the two groups according to the hemisphere helicity rule.}
\par
%\centerline
{\small
\begin{tabular}{llllll}
\hline
\hline
           &       $\textrm{HHR}^{a}$   &    HHR         &  $\textrm{Non-HHR}^{b}$    &     Non-HHR &        \\
$\textrm{Hemisphere}^{c}$  &          S   &            N   &          S  &           N & Total  \\
\hline
A &    14 (74\%) &    13 (93\%)   &   10 (71\%) &    6 (55\%) & 43 (74\%)\\
B &    5  (26\%) &     1  (7\%)   &    4 (29\%) &    5 (45\%) & 15 (26\%)\\
Total       &  19          &  14            & 14          &  11         & 58 (100\%)\\
\hline
\end{tabular}}
\par
\medskip
$^{a}$~HHR means that the active regions satisfy hemisphere helicity rule.
$^{b}$~Non-HHR means that the active regions disobey hemisphere helicity rule.
$^{c}$~N (S) stands for the northern (southern) hemisphere.
\end{table}