\begin{table}%t3
\caption{Amplitudes and phases (in degrees) of the pulsation and modulation 
frequency components of RR Lyr from the 2004 photometric data. The values displayed in {\it italics}
correspond to combination frequencies not exceeding a signal-to-noise level 
of 3.5. For non-combination frequencies the signal-to-noise ratio threshold is
4.0.  The residuals of the fit are at 0.021 mag, which is about the noise
level of the data set.}
\label{table:3}      % is used to refer this table in the text
%\centering
                          % used for centering table
\par
\begin{tabular}{llllll}        % centered columns (4 columns)
\hline               % inserts double horizontal lines
\hline
\multicolumn{3}{c}{$f$ [c/d]} &
\multicolumn{1}{l}{$A$ [mag]} &
\multicolumn{1}{c}{$\phi$ [deg]} &
\multicolumn{1}{c}{$\Delta~\phi$ [deg]} \\
Modulation & Two-frequency & Value &$\Delta~A=0.00052$&&\\
model & model &&&&\\
\hline                        % inserts single horizontal line
\multicolumn{2}{c}{$f_0$}& 1.7641704 $\pm$ 0.0000048 &0.29471&25.71&0.32\\
\multicolumn{2}{c}{$2f_0$}& 3.5283407 &0.13340&189.9&1.4\\
\multicolumn{2}{c}{$3f_0$}& 5.2925111 &0.08794&12.6&2.14\\
\multicolumn{2}{c}{$4f_0$}& 7.0566814 &0.04880&200.62&3.8\\
\multicolumn{2}{c}{$5f_0$}& 8.8208517 &0.02497&	33.4&7.4\\
\multicolumn{2}{c}{$6f_0$}& 10.5850221 &0.01417& 234.8&13.2\\
\multicolumn{2}{c}{$7f_0$}& 12.3491924 &0.00806& 77.7&23.2\\
\multicolumn{2}{c}{$8f_0$}& 14.1133628 &0.00596& 283.6&31.4\\
\multicolumn{2}{c}{$9f_0$}& 15.8775331 &0.00474& 112.0&39.4\\
\multicolumn{2}{c}{$10f_0$}& 17.6417035 &0.00387& 287.7&48.4\\
\multicolumn{2}{c}{$11f_0$}& 19.4058738 &0.00355&125.5&52.8\\
$f_0+f_{\rm B}$&$=f_{\rm N}$& 1.7899187 $\pm$ 0.000026 &0.05640&135.8&3.4\\
$f_0-f_{\rm B}$&$=2f_0-f_{\rm N}$& 1.7384220 &0.00959&147.8&19.6\\
$2f_0+f_{\rm B}$&$=f_0+f_{\rm N}$& 3.5540891 &0.03068&290.9&6.2\\
$2f_0-f_{\rm B}$&$=3f_0-f_{\rm N}$& 3.5025923 &0.01427&294.6&13.2\\
$3f_0+f_{\rm B}$&$=2f_0+f_{\rm N}$& 5.3182594 &0.03371&87.5&5.6\\
$3f_0-f_{\rm B}$&$=4f_0-f_{\rm N}$& 5.2667627 &0.01462&131.2&12.8\\
$4f_0+f_{\rm B}$&$=3f_0+f_{\rm N}$& 7.0824298 &0.03130&260.0&6.0\\
$4f_0-f_{\rm B}$&$=5f_0-f_{\rm N}$& 7.0309330 &0.01048&320.5&17.8\\
$5f_0+f_{\rm B}$&$=4f_0+f_{\rm N}$& 8.8466001 &0.02200&85.0&8.4\\
$5f_0-f_{\rm B}$&$=6f_0-f_{\rm N}$& 8.7951034 &0.00496&187.8&37.8\\
$6f_0+f_{\rm B}$&$=5f_0+f_{\rm N}$& 10.6107704 &0.01327&252.1&14.2\\
\it{$6f_0-f_{\rm B}$}&\it{$=7f_0-f_{\rm N}$}& \it{10.5592737} &\it{0.00285}&\it{15.9}&\it{65.6}\\
$7f_0+f_{\rm B}$&$=6f_0+f_{\rm N}$& 12.3749408 &0.00978&71.4&919.2\\
$7f_0-f_{\rm B}$&$=8f_0-f_{\rm N}$& 12.3234441 &0.00393&176.6&47.6\\
$8f_0+f_{\rm B}$&$=7f_0+f_{\rm N}$& 14.1391111 &0.00637&248.5&29.4\\
\it{$8f_0-f_{\rm B}$}&\it{$=9f_0-f_{\rm N}$}& \it{14.0876144} &\it{0.00302}&\it{44.0}&\it{62.0}\\
$9f_0+f_{\rm B}$&$=8f_0+f_{\rm N}$& 15.9032815 &0.00393& 80.1&47.6\\
\it{$9f_0-f_{\rm B}$}&\it{$=10f_0-f_{\rm N}$}&\it{ 15.8517848} &\it{0.00218}&\it{225.4}&\it{85.8}\\
\it{$10f_0+f_{\rm B}$}&\it{$=9f_0+f_{\rm N}$}&\it{ 17.6674518} &\it{0.00193}&\it{289.0}&\it{97.0}\\
$10f_0-f_{\rm B}$&$=11f_0-f_{\rm N}$& 17.6159551 &0.00309& 37.8&30.3\\
\it{$11f_0+f_{\rm B}$}&\it{$=10f_0+f_{\rm N}$}&\it{ 19.4316222} &\it{0.00033}&\it{48.1}&\it{567.2}\\
\it{$11f_0-f_{\rm B}$}&\it{$=12f_0-f_{\rm N}$}&\it{ 19.3801255} &\it{0.00216}&\it{214.6}&\it{86.6}\\
\it{$f_{\rm B}$}&\it{$=f_{\rm N}-f_0$}&\it{0.0257483} &\it{0.00166}&\it{154.3}&\it{112.6}\\
\hline                                   
\end{tabular}
\end{table}