\begin{table}%t3 [t]
%\centering
\par
\caption{\label{t-compsys} Comparison of the observational
  characteristics of the four new CVs. The (non)detection of X-ray
  emission refers to the ROSAT All Sky Survey
  \citep{vogesetal00-1}. The CV subtypes are abbreviated as
  UX~=~UX~UMa type novalike variable, ZC~=~Z~Cam type dwarf
  nova, VY~=~VY~Scl star.}
%
%\begin{flushleft}
\begin{tabular}{cccccccc}
\hline\hline\noalign{\smallskip} 
Object & \Porb & Radial velocity & 
\multicolumn{3}{c}{Photometric variability} & X-ray & type \\
& [min] & variation & Orbital & Flickering & Long-term \\
\hline\noalign{\smallskip}
%
HS~0139+0559 & 243.7 & clean, moderate amplitude & none & none & none
& no & UX or ZC\\
%
HS~0229+8016 & 232.6 & clean, large amplitude & very low amplitude &
none & $\sim$1.3~mag & no & UX or ZC \\
%
HS~0506+7725 & 212.7 & scatter, low amplitude & not obvious & large
amplitude & $\sim$3~mag low state & yes & VY \\
%
HS~0642+5049 & 225.9 & very low amplitude & moderate amplitude & low
amplitude & none &  maybe & UX or ZC \\
\hline
\end{tabular}
%\end{flushleft}
\end{table}