\begin{table}%t4
\caption{Orbital solutions of RZ~Cas assuming a circular orbit (solution~I) as well 
as a non-circular orbit (solution~II). The orbital period is fixed to~$P=1.1952572$.
$T_{\rm P}$ is the epoch of periastron passage, $T_1$ corresponds to~Min~I, epochs
are given as HJD~2~452~100+. For comparison we list also the elements obtained by
Duerbeck \& H\"anel (\cite{Duer1978}) from metal lines.}\label{tab4}
%\centering
\par
\begin{tabular}{lrrrl}
\hline \hline
                    &Duerbeck     & solution I           & solution II\\
\hline  
$K_1$               & 70.5(1.4)  &  71.36(12)           & 71.691(76) &\kms\\
$\gamma_1$          & $-$45.5(1.1) & $-$44.035(95)          & $-$43.946(54)&\kms\\
$K_2$               &            & $-$200.78(34)          & $-$194.88(67)&\kms\\
$\gamma_2$          &            & $-$44.42(21)           & $-$44.56(51) &\kms\\
$T_1$               &            &  93.3872(57)         & 93.388(15) &(from $T_{\rm P}$)\\
$T_{\rm P}$               &            &                      & 93.3857(80)\\
e                   & 0.024(23)  &                      & 0.0288(12) \\
$\omega$            & 87(2)      &                      & 89.2(2.4)  & deg\\   
\hline
\end{tabular}
\end{table}