\begin{table}%t2
\caption{\snr\ achieved for the different spectra for the three ranges observed with the \newton+\ids.}\label{SNR}
%\centering
\par
\begin{tabular}{c c c c}    
\hline
\hline
 HD~ & 4000--5000 & 4600--5100 & H$_{\rm \alpha}$ \\
\hline
 HD~37020  & 170--280 & 210 & 220 \\
 HD~37022  & 170--330 & 280 & 290 \\
 HD~37023  & 220--450 & 450 & 320 \\
 HD~37041  & 200--275 & 230 & 210 \\
 HD~37042  & 160--220 & 250 & 230 \\
 HD~214680 & 140--190 & 200 & 160 \\
 HD~47839  & 89--120  & 160 & 260 \\
\hline
\end{tabular}
\end{table}