\begin{table}%t3
%\centering
\par
\caption{List of the missing lines, according to the comparison between Arcturus and
          a computed spectrum. The Ni line is not missing, as such, but shifted by
		  2~\AA\ in the atomic database.
\label{arct_lines}}
\begin{tabular}{cc|cc}
\hline\hline
Wavelength ($\mu$m)& Element  & Wavelength ($\mu$m)& Element \\
\hline
\par
1.5764 & Fe &   1.6208 & Fe \\
1.5893 & Fe &   1.6214 & Fe \\
1.5895 & Fe &   1.6231 & Fe \\
1.5913 & Fe &   1.6285 & Fe \\
1.5939 & Fe &   1.6316 & Fe \\
1.5954 & Fe &   1.6319 & Fe \\
1.5968 & Fe &   1.6362 & Ni \\
1.6007 & Fe &   1.6394 & Fe \\
1.6008 & Fe &   1.6440 & Fe \\
1.6041 & Fe &   1.6450 & OH \\
1.6071 & Fe &   1.6517 & Fe \\
1.6076 & Fe &   1.6524 & Fe \\
1.6088 & Fe &   1.6532 & Fe \\
1.6116 & Fe &   1.6569 & Fe \\
1.6126 & Fe &   & \\
1.6175 & Fe &   & \\
1.6195 & Fe &   & \\
\hline
\end{tabular}
\end{table}