\begin{table}%t3
\caption{\label{tab:scarglerslts}Summary of the frequency analysis results. Three different methods
were used to get rid of the brightness increase during two nights of our
observational run (12,~13 and 13,~14~January); see Sect.~\ref{subsect:rotfrqnc}
for more details.}
\small%\centering
\par
\begin{tabular}{cl}
\hline\hline
\multicolumn{2}{c}{Frequency analysis results}\\
\hline
\multicolumn{2}{l}{\em \#1: after prewithening with $f$~=~0.20~c~d$^{-1}$}\\
$U$ & strong one day aliases\\
$B$ & no significant $f$\\
$I$ & 2.64~c~d$^{-1}$ (1, 3 pix)\\
  & 3.64~c~d$^{-1}$ (6 pix)\\
\noalign{\smallskip}%\hline
\multicolumn{2}{l}{\em \#2: after subtracting (free) nightly means}\\
$U$ & no results\\
$B$ & 2.50~c~d$^{-1}$ (1, 3 pix)\\
  & 0.50~c~d$^{-1}$ (6 pix)\\
$I$ & 2.59~c~d$^{-1}$ (all pix)\\
\noalign{\smallskip}%\hline
\multicolumn{2}{l}{\em \#3: two frequency fit (simultaneous)}\\
$U$ & strong one day aliases\\
$B$ & 0.22~c~d$^{-1}$ and 2.56~c~d$^{-1}$ (all pix)\\
$I$ & 0.18~c~d$^{-1}$ and 2.67~c~d$^{-1}$ (all pix)\\
\hline
\end{tabular}
\end{table}