\begin{table}%T4
\caption{\label{table4}The [Fe/H] ratios measured for each color excess in
both fields M92C and M92W with the corresponding rms error and
the number of stars involved in computing each value.}
\small%\centering
\par
\begin{tabular}{ccccc}
 \hline\hline \noalign{\smallskip}
 {\it UV} excess&$\rm \overline{[Fe/H]}$ cluster &N{c}
 &$\rm \overline{[Fe/H]}$ west &N{w}       \\ 
 \hline 
 $\delta(P-X)$&$-2.90 \pm 0.57$& 65 & $-2.07 \pm 0.63$& 31\\
$\delta(P-Y)$&$-2.24 \pm 0.26$ & 78 & $-1.90 \pm 0.25$& 34 \\
$\delta(X-Y)$&$-1.98 \pm 0.34$ & 71 &$-2.13 \pm 0.50$& 34\\ 
\hline
\end{tabular}
\end{table}