\begin{table}%T3
\caption{\label{t:tab2}Reddening estimates for the three globular clusters.}
%\centering
\par
\begin{tabular}{lccc}
\hline\hline\noalign{\smallskip}
Source          &      $E(B-V)$    &      $E(B-V)$    &      $E(B-V)$    \\
                &      NGC~6397     &      NGC~6752     &      47~Tuc      \\
\noalign{\smallskip}\hline\noalign{\smallskip}
Stars used      &        10        &         18       &        12        \\
$b-y$           & $0.178\pm 0.007$ & $0.045\pm 0.007$ & $0.021\pm 0.005$ \\[1mm]
$B-V$           & $0.186\pm 0.006$ & $0.035\pm 0.007$ & $0.035\pm 0.009$ \\[1mm]
average         & $0.183\pm 0.005$ & $0.040\pm 0.005$ & $0.024\pm 0.004$ \\[1mm]
\\
Harris (\cite{Harris1996})     &       0.18       &       0.04       &       0.05       \\[1mm]
Schlegel et~al. (\cite{Schlegel1998}) &       0.187      &       0.056      &       0.032      \\
\hline
\end{tabular}
\end{table}