\begin{table}%t2
\caption{\label{tab2}Synoptic table containing the main results concerning the 6~CVs (see Fig.~\ref{fig6}) identified in the present sample of {\it INTEGRAL} sources.}
\par
%\centering
\par
\begin{tabular}{lcccccccccr}
\hline\hline\noalign{\smallskip}
\multicolumn{1}{c}{Object} & \multicolumn{2}{c}{H$_\alpha$} & 
\multicolumn{2}{c}{H$_\beta$} & \multicolumn{2}{c}{He {\sc ii} $\lambda$4686} & 
$R$ & $A_V$ & $d$ & \multicolumn{1}{c}{$L_{\rm X}$} \\
 & {\it EW} & Flux & {\it EW} & Flux & {\it EW} & Flux & mag & (mag) & (pc) & \\
\hline\noalign{\smallskip}
IGR J04571+4527 & 19.4 $\pm$ 0.6 & 10.3 $\pm$ 0.3 & 9.5 $\pm$ 0.5 & 4.8 $\pm$ 0.2 & 3.6 $\pm$ 0.4 & 1.67 $\pm$ 0.17 & 
 17.5 & $\sim$0 & $\sim$500 & 0.10 (0.1--2.4) \\
 & & & & & & & & & & 53 (17--60) \\
 & & & & & & & & & & 67 (14--150) \\
1RXS J080114.6$-$462324 & 19.9 $\pm$ 0.6 & 7.2 $\pm$ 0.2 & 16.7 $\pm$ 0.8 & 6.5 $\pm$ 0.3 & 9.7 $\pm$ 0.7 & 3.8 $\pm$ 0.3 & 
 14.8 & $\sim$0 & $\sim$150 & 0.064 (0.1--2.4) \\
 & & & & & & & & & & 1.1 (0.2--12) \\
 & & & & & & & & & & 0.43--1.4 (2--10) \\
 & & & & & & & & & & 1.6 (20--100) \\
IGR J12123$-$5802 & 20.3 $\pm$ 1.0 & 7.1 $\pm$ 0.4 & 12.7 $\pm$ 1.3 & 5.1 $\pm$ 0.5 & 7.4 $\pm$ 0.7 & 3.5 $\pm$ 0.3 & 
 15.4 & $\sim$0 & $\sim$190 & 1.9 (2--10) \\
 & & & & & & & & & & 1.6 (20--40) \\ 
 & & & & & & & & & & $<$1.6 (40--100) \\ 
1RXS J165443.5$-$191620 & 38.7 $\pm$ 1.2 & 60.9 $\pm$ 1.8 & 18.5 $\pm$ 0.9 & 33.2 $\pm$ 1.7 & 7.5 $\pm$ 0.5 & 13.4 $\pm$ 0.9 & 
 15.6 & $\sim$0 & $\sim$210 & 0.17 (0.1--2.4) \\
 & & & & & & & & & & 7.7 (20--100) \\ 
IGR J19552+0044 & 271 $\pm$ 8 & 164 $\pm$ 5 & 264 $\pm$ 8 & 168 $\pm$ 5 & 39 $\pm$ 2 & 60 $\pm$ 3 & 
 16.0 & $\sim$0 & $\sim$250 & 0.66 (0.1--2.4) \\
 & & & & & & & & & & 4.2 (0.2--12) \\ 
 & & & & & & & & & & 6.2 (20--40) \\ 
 & & & & & & & & & & $<$4.9 (40--100) \\ 
1RXS J211336.1+542226
& 46 $\pm$ 2 & 5.6 $\pm$ 0.3 & 43 $\pm$ 3 & 2.61 $\pm$ 0.18 & 10 $\pm$ 2 & 5.0 $\pm$ 1.0 & 
18.8 & $\sim$0 & $\sim$910 & 1.3 (0.1--2.4) \\
 & & & & & & & & & & 99 (20--100) \\ 
\hline
\end{tabular}
\tablefoot {{\it EW}s are expressed in \AA, line fluxes are in units of 10$^{-15}$~erg~cm$^{-2}$~s$^{-1}$, whereas X-ray luminosities are in units of 10$^{31}$~erg~s$^{-1}$ and the reference band (between round brackets) is expressed in~keV.}
\end{table}