\begin{table}%t1
\caption{Time spans for which the wavelet power spectra were calculated together with the solar cycle number and hemisphere (N~-- North, S~-- South).}\label{corres}
%\centering
\par
\begin{tabular}{ccccc} 
\hline  \hline
Time span        & Cycle No. & Hemisphere \\ 
\hline
1981.56--1983.75 & 21 & N  \\
1979.62--1981.81 & 21 & S  \\
1986.71--1988.69 & 22 & N  \\
1988.43--1990.62 & 22 & S  \\
1990.22--1992.41 & 22 & S  \\ 
\hline
\end{tabular}
\end{table}