\begin{table}%t2
\caption{\Halp\ {\it EW} measurements obtained from 1992 to 2006$^*$.\label{halpobs}}
%\centerline
 {\begin{tabular}{lccllrlcc}
\hline 
\hline\noalign{\smallskip}
Date & MJD & Orb. phase & Observatory & Instrument & Resolution & Setting$^{**}$ &
\Halp\ {\it EW} & Error \\
(yyyy-MM-dd)  &  &  &  &  & & &(\AA) & (\AA) \\
\hline\noalign{\smallskip}
1992-04-19     &     48~731.250    &    0.85    &    ESO-2.20    &    EFOSC2
    &     3000         &  --   &      $-$2.80        &        0.07 \\
1993-06-19     &     49~257.010    &    0.45    &    OHP-193     &
CARELEC    &     450$^{*}$      &  --   &      $-$2.50        &
0.10\\
1999-08-18     &     51~408.842    &    0.35    &    OAB        &     BFOSC
    &    1600          & Grism\#7    &     $-$2.60        &
0.10\\
2000-09-08     &     51~795.813    &    0.42    &    OHP-193     &
 ELODIE    &     45~000      & --    &       $-$3.24        &
0.10\\
2000-09-10     &     51~797.768    &    0.92    &    OHP-193     &
 ELODIE    &     45~000      & --    &       $-$2.91        &
0.15\\
2000-09-12     &     51~799.768    &    0.43    &    OHP-193     &
 ELODIE    &     45~000      & --    &       $-$3.23        &
0.15\\
2000-10-18     &     51~835.984    &    0.70    &    ESO-1.52     &    FEROS
    &     48,000     & --    &       $-$2.64        &          0.05\\
2000-10-19     &     51~836.983    &    0.96    &    ESO-1.52     &    FEROS
    &     48,000     & --    &      $-$2.61        &          0.05\\
2000-10-20     &     51~838.000    &    0.22    &    ESO-1.52     &    FEROS
    &     48,000     & --    &      $-$2.71        &          0.05\\
2001-05-24     &     52~053.424    &    0.37    &    ESO-VLT-U1    &    FORS1
    &      990         & GRIS\_600V    &      $-$2.69        &
0.07\\
2001-05-26     &     52~055.417    &    0.88    &    ESO-VLT-U1    &    FORS1
    &      990         & GRIS\_600V    &      $-$2.69        &
0.07\\
2001-08-25     &     52~146.858    &    0.29    &    OHP-193     &     ELODIE
&     45~000     & --    &       $-$2.95        &          0.10\\
2001-08-26     &     52~147.857    &    0.55    &    OHP-193     &     ELODIE
&     45~000     & --    &       $-$2.98        &          0.10\\
2001-08-28     &     52~149.848    &    0.06    &    OHP-193     &     ELODIE
&     45~000     & --    &       $-$2.91        &          0.20\\
2001-08-30     &     52~151.822    &    0.56    &    OHP-193     &     ELODIE
&     45~000     & --    &       $-$2.92        &          0.20\\
2001-10-06     &     52~188.978    &    0.08    &    ESO-1.52    &    FEROS
    &     48~000     & --    &      $-$2.64        &          0.10\\
2001-10-07     &     52~189.992    &    0.33    &    ESO-1.52    &    FEROS
    &     48~000     & --   &      $-$2.79        &          0.10\\
2001-10-08     &     52~191.050    &    0.60    &    ESO-1.52    &    FEROS
    &     48~000     & --    &      $-$2.50        &          0.15\\
2001-10-09     &     52~192.000    &    0.85    &    ESO-1.52    &    FEROS
    &     48~000     & --    &      $-$2.53        &          0.10\\
2002-06-14     &     52~439.340    &    0.17    &    ESO-NTT        &    EMMI
    &     5000         & --    &      $-$2.81        &          0.05\\
2002-07-08     &     52~463.335    &    0.31    &    ESO-NTT        &    EMMI
    &     5000         & --    &      $-$2.78        &          0.05\\
2002-07-09     &     52~464.141    &    0.52    &    ESO-NTT        &    EMMI
    &     5000         & --    &      $-$2.80        &          0.05\\
2002-07-10     &     52~465.052    &    0.75    &    ESO-NTT        &    EMMI
    &     5000         & --    &      $-$2.72        &          0.10\\
2002-07-11     &     52~466.214    &    0.06    &    ESO-NTT        &    EMMI
    &     5000         & --    &      $-$2.70        &          0.05\\
2004-07-13     &     53~199.923    &    0.89    &    OHP-193     &    CARELEC
&     900$^{*}$     & Grating 133/375    &      $-$2.60        &
      0.10\\
2004-07-14     &     53~200.937    &    0.15    &    OHP-193     &    CARELEC
&     900$^{*}$     & Grating 133/375    &      $-$2.54        &
      0.10\\
2004-07-16     &     53~202.936    &    0.66    &    OHP-193     &    CARELEC
&     900$^{*}$     & Grating 133/375    &      $-$2.44        &
      0.10\\
2004-07-18     &     53204.906    &    0.17    &      OAB          &
BFOSC   &     2000         & Grism\#8    &      $-$2.47        &
0.10 \\
2004-09-02     &     53~250.935    &    0.95    &    LNA-0.60    &
ESPCASS    &     1460         & --    &      $-$2.60        &
0.10\\
2005-04-07     &     53~467.299    &    0.34    &    LNA-1.60    &    ESPCASS
&     3,600         & Grating 1200/750    &      $-$2.83        &
0.10\\
2005-04-07     &     53~467.299    &    0.34    &    LNA-1.60    &    ESPCASS
&     3,600         & Grating 1200/750    &      $-$2.77        &
0.10\\
2005-07-31     &     53~583.748    &    0.16    &    ESO-NTT        &
EMMI      &     1100         & Grism\#5    &      $-$2.55        &
0.05\\
2005-08-20     &     53~602.935    &    0.07    &    LNA-1.60    &    ESPCASS
&     2,500         & Grating 900/550    &       $-$2.39        &
0.05\\
2005-08-20     &     53~602.963    &    0.08    &    LNA-1.60    &    ESPCASS
&     2,500         & Grating 900/550    &      $-$2.34        &
0.05\\
2005-08-21     &     53~603.078    &    0.10    &    LNA-1.60    &    ESPCASS
&     2,500         & Grating 900/550    &      $-$2.43        &
0.05\\
2005-09-30     &     53~643.005    &    0.33    &    LNA-1.60    &    ESPCASS
&     730         & Grating 300/640    &      $-$2.51        &
0.10\\
2006-05-07     &     53~862.181    &    0.44    &      NOT        &
 ALFOSC    &     3000         & Grism\#16    &      $-$2.40        &
0.10\\
\hline 
\end{tabular}}
\par
\smallskip
$^*$ Spectra with {\it EW} values corrected for the presence of blended telluric
lines.
$^{**}$ The setting of the instrument is shown when relevant.
\end{table}