\begin{table}%t3
%\centering
\par
\caption{\label{tab3}Summary of the properties of the spectroscopic datasets employed in this study.}
\begin{tabular}{lccccccl}
\hline
\hline\noalign{\smallskip}
Date     & MJD & Telescope & Instrument       & Setting   & $\lambda$   & Resln. & Reference\\
&     &      &                  &           & ($\AA$)      &       &          \\
\hline
23--25/06/01    & 52~083-5     & ESO 1.52m &Boller \& Chivens & Grat. \#1  & 6000--11~000 &   500  & C05 \\
         &           &                  &           &       &       &          \\
07/06/02 +&  52~432  & NTT       &  EMMI            & Grat. \#7  & 6310-7835  &  2600  & C05 \\ 
06--08/06/03  & 52796--8    &      &                  & Grat.\#6   & 8225-8900  &  5000  & Negueruela \& Clark (\cite{nc}) \\
         &   &        &                  &           &       &       &          \\
12--13/06/04 & 53168-69  & VLT       & FORS longslit    & G1028z    &   7730--9480      &   $\sim$7000     & Negueruela et~al. (\cite{n09})\\
&   &          &                  & G1200R    &     5750--7310        &    $\sim$7000    & \\
&    &       &FORS MXU          & G1200R    &     7730--9480\tablefootmark{a}     &   2560    & \\   
&    &       &FORS MXU          & G1028z   &      5750--7310\tablefootmark{a} &    2140    & \\
    &      &     &                  &           &       &       &          \\
25/03/05 + &53~454 & VLT       &FLAMES+     & LR6        & 6438--7184  & 8600   & Ritchie et~al. (\cite{benLBV})\\
29/05/05 +& 53519     &     & MEDUSA         & LR8        & 8206--9400  & 6500   & \\
13/07/05& 53~564&          &                  &            &            &        &     \\
         &           &                  &           &       &       &          \\             
29--30/06/05& 53~550-1 & NTT    &   SOFI        & IJ Grism     & 9500--13~500 & 1000       &  Crowther et~al. (\cite{crowther}) \\        
         &          &       &               & HK Grism     & 15~000--22~700      & 1000 & \\
         &           &                  &           &       &       &          \\             
17/02/06    & 53~783 &NTT       & EMMI             &   Grat. \#6      & 5740--8730      & 1500    & Marco \& Negueruela (\cite{marco}) \\
         &           &                  &           & &      &       &          \\   
11-12/03/06& 53805-6 & VLT & ISAAC    &SWS(MR)       & 22~490--23~730 &  9000   & Mengel \&         \\   
        &           &                  &           &    &   &       & Tacconi-Garman (\cite{mengel})      \\ 
          &           &                  &           & &      &       &          \\   
20+29/06/08 + & 54367+76& VLT       &FLAMES+ & HR21        & 8484--9001  & 16200  & Ritchie et~al. (\cite{benbin})\\
18+24/07/08 + & 54665+71     &    & MEDUSA          &        &            &            &        \\    
14+17/08/08 + & 54692+95    &     &                  &     & & & \\
04+15/09/08 +  & 54713+24     &    &                 &                    &            &         \\
19+25/09/08 + & 54728+34     &     &                 &                   &        &  \\  
14+18/05/09 + & 54965+69   &        &                &                    &        &  \\  
20/08/09  & 55063   &  &  &  &        &  \\  
\hline
\end{tabular}
\tablefoot{\tablefootmark{a}{Note that the nominal wavelength range is given for the 2004 FORS MXU observations; in practice this can be displaced
 by a few hundred~$\AA$ depending on the position of an individual star on the CCD.}}
\end{table}