\begin{table}%t4
\caption{\label{tab4}Correlation coefficients between expressions containing $\alpha$ of cycle $i$ and the strength or maximum amplitude of cycle $i+1$.}
%\centerline
{
\begin{tabular}{c c c  c c}  % centered columns (7 columns)
\hline\hline   \noalign{\smallskip}
\multicolumn{2}{c}{Mount Wilson} & \multicolumn{2}{c}{Kodaikanal} \\
&  $r_{\rm c}$  &  $P$   &  $r_{\rm c}$  &  $P$   \\
\hline\noalign{\smallskip}
$\left(\frac{\langle\alpha_{w}\rangle}{\langle\lambda\rangle}S\right)_{i}$ vs. $S_{i+1}$      & $0.65$ & 0.11   & $0.70$   & 0.08  \\
$\max\left(\overline{S} \overline{\alpha_{a,\lambda}}\right)+11~\rm yr$~vs. $\max\left(\overline{S}\right)$     & $0.79$ & 0.03   & $0.78$   & 0.04  \\   \hline      \end{tabular}}
   \medskip
 \tablefoot{Correlation coefficients are represented by $r_{\rm c}$ and the probability that the correlation is due to chance by $P$ for both the MW and KK data sets. The two rows correspond to different expressions explained in the main text.} 
   \vspace{-3mm}\end{table}