\begin{table}%t2
%\centering
\par
 \caption{Spectroscopic range of each order of the \'echelle spectra with resolution $R=30~000$.}\label{t2}
\begin{tabular}{cc||cc}
\hline\hline
Order &  Spectral Range [\AA]  &  Order  & Spectral Range [\AA]\\ \hline
 31 & 7190--7340 &  46 & 4740--4845 \\
 32 & 6960--7120 &  49 & 4655--4560 \\
 33 & 6750--6900 &  47 & 4640--4745 \\
 34 & 6550--6700 &  48 & 4545--4645 \\
 35 & 6360--6510 &  50 & 4365--4465 \\
 36 & 6180--6325 &  51 & 4280--4380 \\
 37 & 6020--6160 &  52 & 4200--4295 \\
 38 & 5860--5995 &  53 & 4125--4215 \\
 39 & 5710--5840 &  54 & 4050--4140 \\
 40 & 5570--5695 &  55 & 3980--4065 \\
 41 & 5430--5560 &  56 & 3910--3995 \\
 42 & 5300--5420 &  57 & 3840--3930 \\
 43 & 5180--5295 &  58 & 3775--3860 \\
 44 & 5060--5190 &  59 & 3710--3795 \\
 45 & 4950--5060 &  60 & 3650--3730 \\
 45 & 4840--4950 &     &     \\\hline
\end{tabular}  
\end{table}