\begin{table}%t2
%\centering
\par
\caption{\label{tab:orbitparam}Orbital and physical parameters derived for the best-fit Keplerian model of Cha~H$\alpha$~8.}
\begin{tabular}{lc}
\hline
\hline\noalign{\smallskip}
Parameter  & Value \\
\hline
\myrule
$P$ (days)...............                \dotfill  & 1895   $\pm$ 132      \\
$T$ (HJD-2~450~000)   ...............      \dotfill  & 3163   $\pm$ 214      \\
$e$                ...............       \dotfill  & 0.59   $\pm$ 0.22     \\
$\omega$ ($^{\circ}$)  ...............          \dotfill  & 106    $\pm$ 26       \\
$K$ (km~s$^{-1}$)        \dotfill  & 2.433  $\pm$ 0.44     \\
$V_0$ (km~s$^{-1}$) ...............       \dotfill  & 16.693 $\pm$ 0.75     \\
\hline
$f(m)$ ($10^{-3}~\msun$)............... \dotfill  & 1.488                \\
$M_2 \sin i $ ($\mjup$)...............   \dotfill  & 25 $\pm$ 7\tablefootmark{a}, 31 $\pm$ 8\tablefootmark{a} \\
$a_1 \sin i$ (AU) ...............        \dotfill  & 0.34   $\pm$ 0.09     \\
$a_2 $ (AU)    ...............           \dotfill  & 1.02 $\pm$ 0.06 \tablefootmark{a}, 1.17 $\pm$ 0.07\tablefootmark{a} \\
\hline
$N_{\rm meas}$  ...............         \dotfill   & 18    \\
Span (days)    ...............          \dotfill   & 3618  \\ 
$\sigma$ (O-C)(m/s) ...............    \dotfill   & 228   \\
$\chi^{2}_{\rm red}$  ...............   \dotfill   & 1.45  \\
\hline
\end{tabular}
\tablefoot{The given parameters are: orbital period,  
periastron time, eccentricity, longitude of periastron,
RV semi-amplitude, system velocity, 
mass function, lower limit of the companion mass,
lower limit of the semi-major axis of the primary,	  
semi-major axis of the companion, number of measurements,
time span of the observations, residuals, reduced $\chi^2$.
\tablefoottext{a}{Derived parameter based on two available estimates 
for the primary mass of 0.07~$\msun$ and 0.10~$\msun$.
No further errors of the primary mass, e.g. as introduced by the use of
evolutionary models, have been taken into account here.}}
\vspace*{-3mm}
\end{table}