\begin{table}%t1
\caption{\label{tbl1}Frequency analysis of the average radial velocity curves of telluric lines, \ion{Fe}{i} and {\sc ii}, \nd\ and \ndt. $N$~indicates the number of lines measured. $A_{\rm max}$~gives the highest radial velocity amplitude, followed by the estimate of False Alarm Probability of the corresponding signal. The last two columns give the amplitude of the variation with $\nu=1.85$~mHz ($P=9.01$~min) and the noise estimate.}
%\centering
\small
\begin{tabular}{lccccc}
\hline
\hline
Ion                  & $N$  & $A_{\rm max}$ & FAP & $A$ & $\sigma$ \\
                     &    & (\ms)         &     & (\ms)        & (\ms)    \\
\hline
\multicolumn{6}{c}{Full data set}\\
Telluric             & 15 &  7.9 & 0.31    &  $2.5\pm2.5$ & 2.6 \\
\ion{Fe}{i},{\sc ii} & 49 &  6.2 & 0.31    &  $1.5\pm1.8$ & 1.8 \\
\ndt\                & 56 & 29.1 & 6.6E-05 & $24.6\pm4.8$ & 4.9 \\
\nd\                 & 29 & 20.5 & 3.6E-06 & $20.4\pm3.0$ & 3.0 \\
\multicolumn{6}{c}{First 1.8~h}\\
\ndt\                & 56 & 46.2 & 8.7E-06 & $44.2\pm5.5$ & 5.5 \\
\nd\                 & 29 & 36.5 & 1.1E-06 & $36.4\pm3.8$ & 3.7 \\
\hline
\end{tabular}
\end{table}