\begin{table}%t2
%%\centering
\par
\caption{Linear correlation coefficients between X-ray and Ca~HK activities of 61 Cygni stellar components~A and~B. \label{tab2}} 
\begin{tabular}{ccc}
\hline\hline
Method of comparison with Ca H+K $S$ & A & B\\
\hline
Closest $S$ data point & 0.58 & 0.73\\
Interpolation between $S$ neighbours & 0.68 & 0.74\\
$S$-curve fit value & 0.93 & 0.88\\
\hline
\end{tabular}
\end{table}