\begin{table}%t1
\caption{\label{obs_table}The summary of the observation details on the RV std, TW Hya, and Gl 86, with all NDIT set to 1.}
%\centering
\par
\begin{tabular}{lcccccc} 
\hline\hline\noalign{\smallskip}
Object &  DIT  [s] & $\#$ of Nodding pairs & Reference Wavelength [nm]  & Slit width [$''$] & Set-up comments \\ 
 \hline 
RV std   & 45   & 2 & 1592.7 & 0.2  & No AO \& No Gas-Cell  \\
TW Hya  & 180  & 2 & 1592.7 & 0.2 & No AO \& No Gas-Cell  \\
Gl 86  & 30  & 3 & 1588.4 & 0.3 & No AO \& No Gas-Cell  \\
\hline 
\end{tabular}
\end{table}