\begin{table}%t1
\caption {\label{Tab:const}Magnetic dipole and electric quadrupole HFS constants of the levels 
considered in this investigation.}
%\centerline
 {\begin{tabular}{ccccc}
	\hline
	\hline
	\noalign{\smallskip}
	Isotope & \multicolumn{2}{c}{3d4s ~ $^1$D$_2$} & 
	\multicolumn{2}{c}{3d4p ~ $^1$D$_2$} \\
	 & $\mathcal{A}$~(MHz) & $\mathcal{B}$~(MHz) & 
	$\mathcal{A}$~(MHz) & $\mathcal{B}$~(MHz) \\
        \hline
        \noalign{\smallskip}
	$^{45}$Sc & 128.2 & --39 & 215.7 & 18 \\
	\hline
\end{tabular}}
\smallskip
Data are taken from \citet{Vil92}. 
\end{table}