\begin{table}%T1
%\centering
\par
\caption{\label{tab1}The impact of shear on the length along the major an minor axes of the tangential and radial critical curves. The upper half of the table refers to the RTM~model with~$x_{\rm p} = 1/\langle c_{{\rm RTM}} \rangle$, while for the lower half~$x_{\rm p} = 0.5 \langle c_{{\rm RTM}} \rangle$. In both cases, the virial mass is set to~\mbox{$M_{\rm v} = 1.125 \times 10^{15}~{M_{\odot}}$}.}
\begin{tabular}{c|cc|cc}
\hline\hline
$\gamma$ & \multicolumn{2}{|c|}{Tangential} & \multicolumn{2}{|c}{Radial} \\
\hline
~ &~$\Delta \xi_x$ &~$\Delta \xi_y$ &~$\Delta \xi_x$ &~$\Delta \xi_y$ \\
\hline
0.05 & $-$8 & 8 & 8 & $-$5 \\
0.10 & $-$14 & 18 & 16 & $-$13 \\
0.15 & $-$21 & 28 & 25 & $-$19 \\
\hline
0.05 & $-$12 & 13 & 13 & $-$12 \\
0.10 & $-$22 & 29 & 28 & $-$22 \\
0.15 & $-$31 & 46 & 45 & $-$31 \\
\hline
\end{tabular}
\end{table}