\begin{table}%t1
\caption{\label{tab:results}Fundamental parameters of \object{NGC~6253} from prior photometric and
spectroscopic studies.}
\small%\centerline
 {
\begin{tabular}{c c c c c c}
\hline\hline
 Source   & $E(B-V)$ & $(m-M)_{0}$ & Age (Gyr) & [Fe/H] &  Aperture (m)\\
\hline
 BR  & $0.23$--$0.32$ & $10.9 \pm 0.1$ & ${\sim}3$ & $\sim$$+0.3$ & $1.5$\\
 PI  & $0.20 \pm 0.05$ & $10.90 \pm 0.40$ & $5.0 \pm 1.5$ & $+0.2$ & $0.61$\\
 SA  & $0.2$ & $11.30 \pm 0.15$ & $2.5 \pm 0.6$ & $+0.4$  & $1$\\
 TW  & $0.260 \pm 0.003$ & $10.8$--$11.3$ & $2.5$--$3.5$ & $\sim$$+0.4-0.7$$^1$ & $0.9$\\
 AT  & $0.16 \pm 0.02$ &  &  & $+0.58 \pm 0.01$ & $0.9$\\
 CA1 & & & & $+0.36 \pm 0.20$ & \\
 CA2 & & & & $+0.46$ & \\
 SE  & & & & $+0.36 \pm 0.07$ & \\
\hline
\end{tabular}}
\medskip
$^1$ The low estimate is based on isochrone fit, the high estimate is from the analysis of photometric indices.
\end{table}