\begin{table}%t9
%\centering
\par
\caption{\label{tab_fit}Polynomial fit coefficients to derive $V-I$ from $B-V$ colour, for stars with no $V-I$ observations.}
\begin{tabular}{lccccc}
\hline\hline\noalign{\smallskip}
&a	&b	&c	&d	&e\\
\hline
& \multicolumn{5}{c}{\bf TW Hya}\\
 $B-V > 0.5$  & 3.163 & --5.014 & 3.028 & ... & ...\\
& \multicolumn{5}{c}{\bf Tucana/Horologium}\\
 $B-V > 0.5$	&+0.821 & --3.550 & +9.978 & --9.190 & +3.047\\
& \multicolumn{5}{c}{\bf Columba}\\
 $B-V > 0.5$	&--0.417 & 2.142 &  --0.578 &... &...\\
& \multicolumn{5}{c}{\bf Carina}\\
$B-V > 0.5$ & 0.296 & 0.545 & 0.260 & ... & ...\\
& \multicolumn{5}{c}{\bf AB Dor}\\
$B-V< 1.6$ &+10.19 & --44.25 & +72.94 & --50.35 & +12.66\\
$B-V > 1.6$ & +0.648 & --0.494 & +0.960 &    ...   &  ...            \\
\hline
\end{tabular}
\end{table}