\begin{table}%t3
      \caption{Radial velocity measurements on CoRoT-8 obtained by
      HARPS and SOPHIE spectrometers.}            
      %\centering
\par
      \begin{tabular}{lcccc}       
      \hline\hline \noalign{\smallskip}                
      BJD\tablefootmark{a} & RV & 1-$\sigma$ error & Exp. time & $S/N$ p. pix. \\
      $-2~400~000$ & (\kms) & (\kms) & (s) &  (at 550~nm) \\
      \hline                        
      \multicolumn{5}{c}{SOPHIE} \\
      %\hline
      54~314.40776 & $-37.6060$ & 0.0490 & 3600 & 12.15 \\
      54 ~318.41015 & $-37.5454$ & 0.0184 & 3600 & 17.00 \\
      \hline 
      \multicolumn{5}{c}{HARPS} \\
      %\hline
      54~675.69652 &	$-37.5050$ & 0.0151 & 2700 & 9.20 \\
      54~678.66557 & $-37.4427$ & 0.0101 & 2700 & 12.20 \\  
      54~679.73180 &	$-37.4751$ & 0.0407 & 2700 & 4.60 \\   
      54~682.68436 &	$-37.4830$ & 0.0112 & 2700 & 11.20 \\  
      54~700.57459 &	$-37.4756$ & 0.0140 & 2700 & 8.90 \\  
      54~703.59565 &	$-37.4611$ & 0.0169 & 2700 & 8.40 \\  
      54~732.56202 &	$-37.4687$ & 0.0080 & 3600 & 14.50 \\  
      54~733.58576 &	$-37.4508$ & 0.0077 & 3600 & 14.80 \\  
      54~737.58497 &	$-37.4955$ & 0.0134 & 3600 & 10.30 \\  
      54~987.78368 &	$-37.4550$ & 0.0237 & 3600 & 7.82 \\  
      54~988.84456 &	$-37.4482$ & 0.0146 & 3600 & 10.92 \\  
      54~989.83528 &	$-37.4540$ & 0.0098 & 3600 & 14.77 \\  
      54~991.85115 &	$-37.4979$ & 0.0157 & 3600 & 10.74 \\  
      54~992.80807 &	$-37.4839$ & 0.0106 & 3600 & 13.68 \\  
      54~993.87346 &	$-37.4610$ & 0.0113 & 3600 & 13.30 \\  
      54~998.85102 &	$-37.5006$ & 0.0106 & 3600 & 12.20 \\  
      55~021.82951 &	$-37.4656$ & 0.0102 & 3600 & 14.22 \\  
      55~045.74089 &	$-37.4139$ & 0.0148 & 3600 & 10.95 \\  
      55~046.73467 &	$-37.4888$ & 0.0179 & 3600 & 9.47 \\  
      \hline                                   
      \end{tabular}
     \tablefoot{ \tablefoottext{a}{Barycentric Julian Date.}}\vspace{-3mm}
      \label{tab:rv}      
   \end{table}