\begin{table}
\caption{Power in regions I, II and III.}              
\label{table:power}     
%\centering
              
\begin{tabular}{c c c c}       
\hline\hline                 
Frequency range & region I: & region II: & region III: \\
mHz & Bright plage & Intermediate plage &  Quiet Sun \\    
\hline                       
Continuum & & & \\
0.4--1.6  & 0.69 & 0.85 & 1.17 \\
2.4--4    & 0.82 & 0.90 & 1.11 \\
5.2--8    & 1.02 & 0.97 & 1.01 \\
Ca II K     & & & \\
0.4--1.6  & 0.73 & 1.02 & 1.06 \\
2.4--4    & 1.12 & 0.85 & 1.06 \\
5.2--8    & 0.71 & 0.69 & 1.27 \\
\par
\hline                                 
\end{tabular}
\end{table}