\begin{table}%t2
\caption{\label{tab:timedepX}Variation of the flickering parameters in some CVs of the \mbox{X-ray} sample.}
\small
%\centering
\par
\begin{tabular}{l r c c}
\hline\hline \noalign{\smallskip}
Object name & $\Delta T$ (d) & $|\Delta \alpha|$ & $|\Delta \Sigma|$ \\
\hline
AM Her       &    2.0 & $0.29 \pm 0.22$ & $0.08 \pm 0.39$ \\
CD Ind       &    6.0 & $0.78 \pm 0.32$ & $0.68 \pm 0.22$ \\
EI UMa       &  176.3 & $0.19 \pm 0.11$ & $0.08 \pm 0.20$ \\
EX Hya       &    0.6 & $0.03 \pm 0.18$ & $0.03 \pm 0.29$ \\
HT Cas       &  325.9 & $0.04 \pm 0.14$ & $0.01 \pm 0.21$ \\
MR Vel       &    2.0 & $0.03 \pm 0.17$ & $0.09 \pm 0.28$ \\
NY Lup       &  351.2 & $0.07 \pm 0.14$ & $0.11 \pm 0.25$ \\
OY Car       &   38.4 & $0.36 \pm 0.13$ & $0.21 \pm 0.20$ \\
RXJ0704+2625 &  170.4 & $0.11 \pm 0.33$ & $0.13 \pm 0.54$ \\
RXJ2133+5107 &   38.3 & $0.09 \pm 0.13$ & $0.06 \pm 0.23$ \\
V2400 Oph    &  346.5 & $0.01 \pm 0.13$ & $0.13 \pm 0.22$ \\
V2487 Oph    & 2025.8 & $0.11 \pm 0.17$ & $0.23 \pm 0.34$ \\
V2491 Cyg    &    9.8 & $0.48 \pm 0.14$ & $0.59 \pm 0.24$ \\
V4743 Sgr    &  544.8 & $1.16 \pm 0.14$ & $0.37 \pm 0.23$ \\
XY Ari       &  163.4 & $0.22 \pm 0.17$ & $0.11 \pm 0.27$ \\
Z Cha        &  650.2 & $0.05 \pm 0.13$ & $0.81 \pm 0.21$ \\
\hline
\end{tabular}
\end{table}