\begin{table}%t2
\caption{Atomic parameters of the spectral lines employed in the Ca
stratification analysis. }\label{strat-list}
%\centerline
{\small\begin{tabular}{lcrrcc}
\hline\hline\noalign{\smallskip}
Ion &$\lambda$ (\AA) &$E_{\rm i}$~(eV)  &$\log~{gf}$&$\log~\gamma_{\rm St}$ & Reference \\
\hline
\ion{Ca}{ii}&  3158.869& 3.123 &    0.241& $-$4.90 & T  \\ 
\ion{Ca}{ii}&  3933.655& 0.000 &    0.105& $-$5.73 & T  \\ 
\ion{Ca}{i} &  4226.728& 0.000 &    0.244& $-$6.03 & SG \\ 
\ion{Ca}{ii}&  5021.138& 7.515 & $-$1.207& $-$4.61 & SMP \\ 
\ion{Ca}{ii}&  5339.188& 8.438 & $-$0.079& $-$3.70 & SMP \\
\ion{Ca}{i} &  5857.451& 2.933 &    0.240& $-$5.42 & S \\ 
\ion{Ca}{i} &  5867.562& 2.933 & $-$1.570& $-$4.70 & S \\ 
\ion{Ca}{i} &  6122.217& 1.896 & $-$0.316& $-$5.32 & SO \\ 
\ion{Ca}{i} &  6162.173& 1.899 & $-$0.090& $-$5.32 & SO \\ 
\ion{Ca}{i} &  6163.755& 2.521 & $-$1.286& $-$5.00 & SR \\ 
\ion{Ca}{i} &  6166.439& 2.521 & $-$1.142& $-$5.00 & SR \\ 
\ion{Ca}{i} &  6169.042& 2.253 & $-$0.797& $-$5.00 & SR \\ 
\ion{Ca}{i} &  6169.563& 2.256 & $-$0.478& $-$4.99 & SR \\ 
\ion{Ca}{i} &  6449.808& 2.521 & $-$0.502& $-$6.07 & SR \\ 
\ion{Ca}{i} &  6455.598& 2.523 & $-$1.340& $-$6.07 & S \\ 
\ion{Ca}{ii}&  6456.875& 8.438 &    0.410& $-$3.70 & SMP \\ 
\ion{Ca}{i} &  6462.567& 2.523 &    0.262& $-$6.07 & SR \\ 
\ion{Ca}{i} &  6471.662& 2.526 & $-$0.686& $-$6.07 & SR \\ 
\ion{Ca}{ii}&  8248.796& 7.515 &    0.556& $-$4.60 & SMP \\ 
\ion{Ca}{ii}&  8254.721& 7.515 & $-$0.398& $-$4.60 & SMP \\ 
\ion{Ca}{ii}&  8498.023& 1.692 & $-$1.416& $-$5.70 & T  \\ 
\ion{Ca}{ii}&  8912.068& 7.047 &    0.637& $-$5.10 & SMP\\ 
\ion{Ca}{ii}&  8927.356& 7.050 &    0.811& $-$5.10 & SMP\\ 
\hline
\end{tabular}}
\smallskip
The columns give the ion designation,
central wavelength of the transition, the excitation potential of the lower level, 
oscillator strength, the Stark damping constant, and the reference for 
the oscillator strength. 
References. T -- Teodosiou (\cite{T}); SG -- Smith \& Gallagher (\cite{SG}); SMP -- Seaton et~al. (\cite{TB}); S -- Smith (\cite{S}); SO -- Smith \& O'Neil (\cite{SN}); SR -- Smith \& Raggett (\cite{SR}).
\end{table}