\begin{table}%t1
%\centering
\par
\caption{\label{tab1}Observed data from the Arcturus IR Atlas (Hinkle et~al. \cite{Hinkle95}).}
\small \begin{tabular}{c c c c c }
\hline \hline
\noalign{\smallskip}
Sp. ref.  &     Freq. band  &    Res. &   Obs. date  &    Shift\\
    &     (cm$^{-1}$) &  (cm$^{-1}$) &        &  (km~s$^{-1}$) \\
\hline
1   &   1867--1965   &    0.02 &   1994 Jan. 9 &  --30.52 \\
2   &   1965--2021  &   0.02  &  1994 Jan. 21 & --30.52   \\
3   &   2021--2098  &   0.02  &  1994 Jan. 7 &  --31.66   \\
4   &   2119--2189  &   0.02  &  1994 Jan. 7 &  --31.39 \\
5   &   2021--2098   &    0.02 &   1993 Jun. 7 &   14.63  \\
6   &   2119--2189   &   0.02  &  1993 Jun. 7  &  14.90  \\
7   &   4000--6675   &    0.04  &  1993 Jun. 5  &  14.33  \\
\hline
\end{tabular}
\end{table}