\begin{table}%t2
\par
\caption{\label{tab:lines}Lines studied in the present work and their parameters.}
%\centerline
 {\begin{tabular}{ccrrr}
\hline\hline
Atomic species & $\lambda$ [nm] & $\log gf$ & $E_{{\rm low}}$ [eV] & $W_{\mu=1}$ [pm]$^{{a}}$ \\
\hline
\noalign{\smallskip}
Fe~\textsc{i} & 615.1618$^{{d}}$ & --3.299$^{{c}}$ &  2.18$^{{c}}$ & 4.95\\
Si~\textsc{i} & 615.5693$^{{b}}$ & --2.252$^{{b}}$ &  5.62$^{{b}}$ & 0.61\\
Ca~\textsc{i} & 615.6023$^{{b}}$ & --2.497$^{{b}}$ &  2.52$^{{b}}$ & 0.92\\
Fe~\textsc{i} & 615.7728$^{{d}}$ & --1.260$^{{b}}$ &  4.08$^{{c}}$ & 6.45\\
O~\textsc{i}  & 615.8186$^{{c}}$ & --1.841$^{{c}}$ & 10.74$^{{c}}$ & 0.63\\
Fe~\textsc{i} & 615.9378$^{{d}}$ & --1.970$^{{b}}$ &  4.61$^{{b}}$ & 1.21\\
%
Fe~\textsc{i} & 629.0965$^{{b}}$ & --0.774$^{{b}}$ & 4.73$^{{b}}$ & 7.06\\
Fe~\textsc{i} & 629.7792$^{{c}}$ & --2.740$^{{c}}$ & 2.22$^{{c}}$ & 7.54\\
{} [O~\textsc{i}] & 630.0304$^{{c}}$ & --9.717$^{{e}}$ & 0.00$^{{c}}$ & 0.45\\
Sc~\textsc{ii} & 630.0698$^{{b}}$ & --1.887$^{{b}}$ & 1.51$^{{b}}$    & 0.59\\
O~\textsc{i}  & 777.1944$^{{c}}$ & 0.369$^{{c}}$ & 9.15$^{{c}}$ & 8.48\\
O~\textsc{i}  & 777.4166$^{{c}}$ & 0.223$^{{c}}$ & 9.15$^{{c}}$ & 7.44\\
O~\textsc{i}  & 777.5390$^{{c}}$ & 0.002$^{{c}}$ & 9.15$^{{c}}$ & 5.90\\
Fe~\textsc{i} & 778.0557$^{{b}}$ & 0.029$^{{b}}$ & 4.47$^{{b}}$  & 14.81\\
\hline 
\end{tabular}}
\par
 \smallskip
   $^{{a}}$  Equivalent widths at disk-centre measured from our observations.
   $^{{b}}$~VALD database \citep{VALD1,VALD2}.
   $^{{c}}$~NIST database \citep{NIST}.
   $^{{d}}$~\citet{Nave1994}.
   $^{{e}}$~\citet{Storey2000}.
\end{table}