\begin{table}%t2
\caption{\label{tab: opt_diary}Sample of the journal of the spectroscopic observations of \hda.} 
\small%\centerline
 {
\begin{tabular}{rrrrr  }
\hline\hline
HJD & $\phi_{\lambda4686}$  & $RV_1$ & Exp & {\it SNR} \\
\hline
3860.81531 & 0.804  &     20.15  &  900 & 320 \\  
3861.66960 & 0.005  & $-$133.85  &  900 & 323 \\  
3861.92118 & 0.064  & $-$149.33  &  900 & 361 \\  
3862.65506 & 0.237  &  $-$69.29  &  900 & 284 \\  
3862.90246 & 0.296  &  $-$29.43  &  900 & 356 \\  
3863.64302 & 0.470  &     74.92  &  900 & 294 \\  
3863.88654 & 0.528  &     90.92  &  900 & 380 \\  
3864.65014 & 0.708  &     67.76  &  720 & 310 \\  
3864.86446 & 0.758  &     42.87  &  600 & 334 \\  
3911.50709 & 0.758  &     38.58  & 1200 & 142 \\   
3911.52338 & 0.762  &     38.77  & 1500 & 276 \\
3911.55914 & 0.771  &     29.30  &  900 & 215 \\
3911.57020 & 0.773  &     28.47  &  900 & 275 \\
3911.58127 & 0.776  &     27.06  &  900 & 223 \\
3911.61757 & 0.784  &     17.72  & 1200 & 194 \\
3911.63210 & 0.788  &     15.42  & 1200 & 229 \\
3911.64664 & 0.791  &     15.23  & 1200 & 213 \\
3911.66996 & 0.797  &     14.08  & 1200 & 306 \\
3911.68451 & 0.800  &     13.18  & 1200 & 325 \\
3911.69905 & 0.804  &     14.59  & 1200 & 368 \\
3911.71393 & 0.807  &     14.65  & 1200 & 276 \\
3911.72847 & 0.811  &     14.59  & 1200 & 285 \\
3911.76994 & 0.820  &     14.52  & 1200 & 302 \\
3911.79196 & 0.826  &     12.80  & 1020 & 249 \\
 \hline			        
\end{tabular}}		           			\medskip
``HJD'' gives heliocentric Julian date (HJD$-$2~450~000) at mid-exposure. $\phi_{\lambda4686}$ indicates the corresponding phase according to the new \heb\l4686\ ephemeris of Table~\ref{tab: orbit}. $RV_1$~gives the primary radial velocity  as measured on the \heb\l4686 line. ``Exp''~lists the exposure time (in seconds) while ``{\it SNR}'' indicates the measured signal-to-noise ratio in the range 4740$-$4750~\AA. The full table is available at the~CDS.
\end{table}