\begin{table}%t4
\caption{\label{table:sigmaw30}Derived velocity dispersion for different portions of the
spectra of W30 in NGC~7252.  All values are given in km~s$^{-1}$.}
%\centerline
{\begin{tabular}{c c c c}
\hline\hline
Mg$^{a}$ & Fe$^{b}$ & Full$^{c}$ & Adopted \\
\hline
24.7  & 30.3 & 28.0 & 27.5 $\pm$ 2.5 \\
\hline
\end{tabular}}
\smallskip
\begin{list}{}{}
\item[$^{{a}}$] Just the Mg triplet, from 5156~\AA~to 5187~\AA.
\item[$^{{b}}$] Red-ward of the  Mg triplet, mainly dominated by
Fe~lines, from~5218~\AA~to 5351~\AA.
\item[$^{{c}}$] The full spectrum used, from 5155~\AA~to 5324~\AA.
\end{list}
\end{table}