\begin{table}%t4
\caption{Adopted parameters for the BLS algorithm: nf is the
number of frequency steps adopted, {\em fmin} is the minimum frequency
considered, {\em df} is the increasing frequency step, {\em nb} is the number
of bins in the folded time series at any test frequency, {\em qmi} and {\em qma}
are the minimum and maximum fractional transit length to be tested,
as explained in the text.
\label{tab:parametri}
}
%\begin{center}
\par
\begin{tabular}{ c c c c c c}
\hline\hline\noalign{\smallskip}
   {\em nf} & {\em fmin}~(days$^{-1}$) & {\em df} (days$^{-1}$) & {\em nb} & {\em qmi} & {\em qma}  \\
\hline
 3000 & 0.1 & 0.0005 & 1000 & 0.01 & 0.1 \\
\hline
\end{tabular}
%\end{center}
\par
\end{table}