\begin{table}%t1
%\centering
\par
\caption{IOTA observations for R~CrB.  
$B_{\rm p}$: projected baseline length, 
PA: position angle of the projected baseline, 
$N_{\rm T}$: number of interferograms acquired for the target,   
$N_{\rm R}$: number of interferograms acquired for the 
reference star, 
$T$: exposure time of each frame.
}
\label{obslog}
\begin{tabular}{cc}
\hline\hline
\noalign{\smallskip}
           &  2001 Jun. 05, 06    \\
\noalign{\smallskip}
\hline
\noalign{\smallskip}
JD         &  2452067, 2452068   \\
$V$ (mag)  &  6          \\
$B_{\rm p}$&  21.2~m \\
PA       &  167$^{\circ}$\\
Spectral resolution ($\lambda/\Delta \lambda$) &  $\sim$$ 30$\\
Reference star  & HD~143393, HR~5877  \\
 $N_{\rm T}$  &  7700 \\
 $N_{\rm R}$  &  5000  \\
 $T$(ms)      &  300  \\
\hline
\end{tabular}
\end{table}