\begin{table}%t2
\caption{\label{tab:obs}Observations summary.}
%%\centerline

 {\small \begin{tabular}{*{6}{c}}
\hline\hline
Date and  & Baseline & Pos. Angle &   Seeing & Source & Target \\
Config. & m & $^\circ$ EoN & \arcsec & HD & type \\
  \hline 
05/03/2007 &  98.9 &  40.5 & 0.60 & 61~935 & Cal$^a$ \\
UT1-UT3    &  96.4 &  40.9 & 0.55 & 69~830 & Sci \\
D1         & 102.1 &  38.4 & 0.95 & 95~272 & Cal \\
           & 101.8 &  39.5 & 1.30 & $\eta$ Corvi & Sci \\
           & 102.4 &  38.0 & 1.50 & 116~870 & Cal \\
\hline
07/03/2007 &  59.5 & 113.4 & 1.15 & 61~935 & Cal \\
UT3-UT4    &  60.4 & 113.7 & 1.30 & 69~830 & Sci \\
A          &  59.8 & 114.3 & 1.25 & 73~840 & Cal$^b$ \\
           &  58.0 & 105.4 & 0.75 & 116~870 & Cal \\
           &  62.4 & 109.0 & 0.80 & $\eta$ Corvi & Sci \\ 
           &  62.1 & 112.5 & 0.65 & 107~218 & Cal \\ \hline
08/03/2007 & 130.2 &  63.1 & 0.90 & 61~935 & Cal \\
UT1-UT4    & 130.2 &  62.8 & 0.75 & 69~830 & Sci \\
C          & 130.1 &  63.3 & 0.75 & 73~840 & Cal \\
UT1-UT3    & 100.2 &  31.5 & 1.15 & 116~870 & Cal \\
D2         & 102.3 &  38.3 & 1.60 & $\eta$ Corvi & Sci \\ 
           & 102.2 &  36.5 & 0.70 & 116~870 & Cal \\
\hline
09/03/2007 &  42.7 &  32.5 & 1.50 & 61~935 & Cal \\
UT2-UT3    &  44.4 &  43.8 & 1.55 & 69~830 & Sci \\
B          &  44.2 &  34.3 & 1.20 & 73~840 & Cal \\
           &  42.2 &  26.8 & 0.65 & 116~870 & Cal \\
           &  46.1 &  39.2 & 0.75 & $\eta$ Corvi & Sci \\ 
           &  46.6 &  42.4 & 1.15 & 107~218 & Cal \\
\hline
\end{tabular}}
\medskip
  Baselines and position angle (projected on the sky) are
  given as the mean for the observation. $^a$~The first standard
  star observation on run~D1 (of HD61935) showed great variation in
  visibility with wavelength (see Sect.~2.4), and so this was
rejected as a suitable observation for calibration;  $^b$~during run~A the observation of standard star HD73840 could not be used, as the telescope beams showed poor alignment on the readout array. Thus the   observation of HD69830 was calibrated with HD61935 only, since the   next usable observation of a standard (HD116870) was taken much   later in the night after sky conditions had changed\protect significantly. 
\end{table}