\begin{table}%t2
%\centering
\par
\caption{Radial-velocity parameters for H$\alpha$ as derived by the analysis 
of the diagnostic diagram. Column\ 2 gives the $FWHM$ of the Gaussians used for the
diagram, Col.\ 3 the critical separation, Cols.\ 4 and 5 contain the
resulting semi-amplitude and the error of the zero phase, respectively.
The $\gamma$ parameter is not listed, as it reflects more the wavelength
calibration process than a real physical parameter.} \label{ddpar_tab}
{
\begin{tabular}{lclrll}
\hline\hline
data set & $FWHM$ & $d_{\rm max}$ & \multicolumn{1}{c}{$K_{\rm em}$} & 
 $\sigma(\varphi_0)$ & Fig.\\
 & [{\AA}] & [{\AA}] & [km/s] & [orbits] & \\
\hline
AK Cnc   & 4 & 34 & 42(09) & 0.036 & \ref{akdd_fig} \\
WX Cet   & 4 & 52 & 59(18) & 0.061 & \ref{wxdd_fig} \\
AQ Eri   & 2 & 44 & 36(09) & 0.042 & \ref{aqdd_fig} \\
VW Hyi   & 4 & 40 & 38(09) & 0.039 & \ref{vwdd_fig} \\
RZ Leo 1 & 4 & 66 & 49(13) & 0.042 & -- \\
RZ Leo 2 & 4 & 62 & 51(15) & 0.050 & \ref{rzdd_fig} \\
TU Men   & 2 & 48 & 84(09) & 0.017 & \ref{tudd_fig}\\
HS Vir   & 2 & 64 & 98(09) & 0.017 & \ref{hsdd_fig} \\
\hline
\end{tabular}}
\end{table}