\begin{table}%t1
\caption{Log of the photometric Johnson $V$ band observations of RR Lyr.}  
\label{table:1}      % is used to refer this table in the text
\par
             % used for centering table
%\centerline
{\begin{tabular}{l c c c c c l}        % centered columns (4 columns)
\hline
\hline               % inserts double horizontal lines
\multicolumn{1}{l}{Observatory} &
\multicolumn{1}{c}{$N$ Data} &
\multicolumn{1}{c}{$N$ Nights} &
\multicolumn{1}{c}{$N$ Hours} &
\multicolumn{1}{c}{HJD(begin)$^{*}$} &
\multicolumn{1}{c}{HJD(end)$^{*}$} &
\multicolumn{1}{l}{Observers} \\
\hline                        % inserts single horizontal line
Michigan State University & 700$^{**}$ & 7$^{**}$ &
11.05$^{**}$ & 2915.5289$^{**}$ & 2950.5715$^{**}$ & HAS \\
Michigan State University  & 7492 & 55 & 141.96 & 3142.6229 & 3322.5803 & HAS \\
Athens University Observatory & 4810 & 7 & 49.91 & 
3213.3158 & 3278.4990 & KDG, PGN \\
APT Arizona & 457 & 15 & 45.57 & 3184.8050 & 3336.6100
& robotic \\
Ankara University Observatory & 649 & 6 & 34.72 & 3224.2939 &
3268.4783 & AE, BA, SOS, IO, OA \\
Beersel Hills Observatory & 232 & 5 & 9.25 & 
3305.2902 & 3319.3134 & PVC, PL \\
Vienna Observatory & 362 & 3 & 7.83 & 3253.3476 &
3253.5062 & KK \\
\hline
\end{tabular}}
 \medskip
$^{*}$  HJD(--2~450~000);
$^{**}$  2003 data.
\end{table}