\begin{table}%t2
\caption{\label{rvobs}Radial velocity measurements of WASP-11.}
\small%\centering
\par
\begin{tabular}{ccccc}
\hline\hline
BJD & RV & $\sigma_{RV}$ & $v_{\rm span}$ & Inst \\
(UT) & (km~s$^{-1}$) & (km~s$^{-1}$) & \\
\hline
245~4462.395   & 4.8689 & 0.0185 & & NOT \\
245~4463.456   & 4.8725 & 0.0203 & & NOT \\
245~4465.404   & 4.9208 & 0.0258 & & NOT \\
245~4466.440   & 4.8262 & 0.0244 & & NOT \\
245~4466.443   & 4.9486 & 0.0246 & & NOT \\
245~4491.424   & 4.9339 & 0.0220 & & NOT \\
245~4508.3700 & 4.8910 & 0.0103  & 0.011 & SOPHIE \\
245~4509.3534 & 5.0104 & 0.0084  & 0.000 & SOPHIE \\
245~4510.3813 & 4.8989 & 0.0120  & 0.025 & SOPHIE \\
245~4511.3092 & 4.8515 & 0.0076  & --0.002 & SOPHIE \\
245~4511.3800 & 4.8330 & 0.0106  & --0.002 & SOPHIE \\
245~4511.4206 & 4.8235 & 0.0143  & --0.035 & SOPHIE \\
245~4512.3848 & 4.9482 & 0.0096  & 0.022 & SOPHIE \\
\hline
\end{tabular}
\end{table}