\begin{table}%t4
\caption{\label{tab:selectlog}Data subset used for the frequency analysis.  }                                                       \small%\centerline
{                    
\begin{tabular}{ccccc}                                                                                                                                       
\hline\hline                                                                                                                                                 
Date   & JD$_{\rm first}$      & JD$_{\rm last}$       & N$_{\rm spec}$        
&Duration\\                                                                  
(1)             &  (2)                          &  (3)                          
&   (4)                         &   (5)       \\                             
\hline                                                                                                                                                       
Jan. 12  & 3747.9537             & 3748.1607             &  26 &  4.97\\                                                                                       
Jan. 13  & 3749.0013             & 3749.1099             &  13 &  2.60\\                                                                                        
Jan. 14  & 3749.8911             & 3749.9411             &  6   &  1.20\\                                                                                       
Jan. 15  & 3751.0417             & 3751.1838             &  16 &  3.41\\                                                                                      
Jan. 16  & 3751.8958             & 3752.1861             &  28 &  6.97\\                                                                                      
Jan. 18  & 3753.9037             & 3754.1257             &  16 &  5.33\\                                                                                      
Jan. 19  & 3754.9015             & 3754.9259             &  8   &  1.32\\                                                                                       
Jan. 20  & 3756.0609             & 3756.1912             &  16 &  3.13\\                                                                                      
Jan. 22  & 3757.9004             & 3758.1621             &  32 &  6.28\\\hline                                                                                
Total&&& 161 & 35.2\\ \hline
\end{tabular}}
\smallskip
(1) 
Date (2006); (2) Julian date (2~450~000+) of the first; and (3) last observation
of the night; (4) number of spectra; and (5) summed exposure time (hrs) of the night.
\end{table}