\begin{table}%t11
\caption{Average radial velocities of nine absorption lines in the spectrum of HD~168112 as measured on our SPM and FEROS~data. The third column yields the instrumentation used for the observation: echelle spectrograph at San Pedro (SPM), FEROS at the 1.5~m telescope (F1.5) or FEROS at the 2.2~m telescope (F2.2).}\label{tab: diary} 
%\centering
\par
\begin{tabular}{c c c}
\hline \hline
\multicolumn{1}{c}{Date} & $\overline{RV}$ & Inst.\\
\multicolumn{1}{c}{HJD $-$ 2~450~000} & (km~s$^{-1}$) & \\
\hline
2040.746 & 15.8 & F1.5 \\
2382.900 & 21.1 & F1.5 \\
2745.919 & 12.1 & SPM \\
2746.875 & 18.4 & SPM \\
2747.867 & 11.3 & SPM \\
2748.842 & 20.8 & SPM \\
2749.876 &  7.2 & SPM \\
2750.864 & 13.2 & SPM \\
2783.820 & 16.4 & F2.2 \\
2784.815 & 18.4 & F2.2 \\
\hline
\end{tabular}
\end{table}