\begin{table}%T6
%\centering
\small
\caption{Results of Fourier analysis applied to the 1999 data set of 
Zhou et~al. (\cite{Zhou01}). The sigma of the residuals is 13.7~mmag.} 
\label{t6}\begin{tabular}{lrr}  \hline\hline
Frequency  & $\Delta V$~~ & {\it S/N} \\
~~~(cd$^{-1}$) & (mmag) & ~ \\ \hline
~& $\pm$0.5~ & ~ \\
$f_0=25.5769$      & 145.7~ &       132.5 \\
2$f_0$             &  30.4~ &        30.4 \\
3$f_0$             &   4.4~ &         6.3 \\
$f_1=31.6759$      &   7.0~ &         7.0 \\
$f_2=25.2469$      &   7.6~ &         6.9 \\
$f_3=50.8312$      &   4.1~ &         4.6 \\
(${\sim}f_0+f_2$)&   ~   &         ~   \\  
$f_4=32.5456$      &   5.6~ &         5.6 \\
$f_5=25.9122$      &   5.1~ &         4.6 \\
$f_6=33.1129$      &   4.8~ &         4.8 \\
$f_7=25.6653$      &   4.7~ &         4.3 \\
\hline
\end{tabular}
\end{table}