\begin{table}%t1
%\centering
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\begin{minipage}[t]{17cm}
\caption{Experimental radiative lifetimes of \ion{Ca}{i}.}
\label{Lifetable}
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\renewcommand{\footnoterule}{}
\begin{tabular}{l l c c r c c c c c}
\hline\hline
\\[-3mm]
Level & Energy\footnote{From Risberg (\cite{Risberg68}).} & $\lambda_{{\rm exc}}$\footnote{Laser wavelength used to populate the upper state.} & \multicolumn{7}{c}{Lifetime\footnote{Lifetime references: [1] Gornik et~al. (\cite{Gornik73}), [2] Havey et~al. (\cite{Havey77}), [3] Emmoth et~al. (\cite{Emmoth75}), [4] Osherovich $\&$ Pul'kin (\cite{Osherovich77}), [5] Froese Fischer \&  Tachiev (\cite{Froese03}), [6] Kurucz (\cite{Kurucz08}).} (ns)} \\ \cline{4-10}
 & (cm$^{-1})$ & (\AA ) & This~Work (Unc.) & [1] (Unc.) & [2] (Unc.) & [3] (Unc.) & [4] (Unc.) & [5] & [6] \\
\hline
\\[-3mm]
4s5s\hspace{0.7mm}$^{3}$S$_{1}$ & 31539.495 & 6162.4 & 13.8 \hspace{0.7mm}(1.2) & 10.7 \hspace{0.7mm}(1.6) & 11.7 \hspace{0.7mm}(0.6) & 10.0 \hspace{0.7mm}(1.0) &                          & 11.7 & 10.4 \\
4s4d\hspace{0.7mm}$^{3}$D$_{1}$ & 37748.197 & 4425.3 & 13.6 \hspace{0.7mm}(1.0) & 12.3 \hspace{0.7mm}(1.8) &                          &                          & 12.2 \hspace{0.7mm}(0.5) & 11.9 & 13.7 \\
4s4d\hspace{0.7mm}$^{3}$D$_{2}$ & 37751.867 & 4455.7 & 14.1 \hspace{0.7mm}(1.1) &                          &                          &                          &                          & 11.9 & 13.8 \\
4s4d\hspace{0.7mm}$^{3}$D$_{3}$ & 37757.449 & 4454.7 & 15.4 \hspace{0.7mm}(1.2) &                          &                          &                          &                          & 11.9 & 13.9 \\
4s5d\hspace{0.7mm}$^{3}$D$_{1}$ & 42743.002 & 3644.9 & 27.0 \hspace{0.7mm}(2.0) &                          &                          &                          &                          &      & 35.5 \\
4s5d\hspace{0.7mm}$^{3}$D$_{2}$ & 42744.716 & 3644.7 & 27.0 \hspace{0.7mm}(2.0) &                          &                          &                          &                          &      & 35.7 \\
4s5d\hspace{0.7mm}$^{3}$D$_{3}$ & 42747.387 & 3644.3 & 27.0 \hspace{0.7mm}(2.0) &                          &                          &                          &                          &      & 35.8 \\
\hline
\end{tabular}
\end{minipage}
\end{table}