\begin{table}%T3
\par
 \caption{\label{tab3}Calculated observed $W_{\lambda}$ ratios with errors. }
\small%\centering
\par
\begin{tabular}{lcccc}
\hline\hline
$\lambda$ & 4232        &   3957        &   3745        &   3579    \\
\hline
4232    &           &           &           &       \\
3957    &   1.82~$\pm$~0.03   &           &           &       \\
3745    &   4.04~$\pm$~0.11   &   2.21~$\pm$~0.04   &           &       \\
3579    &   9.99~$\pm$~0.53   &   5.64~$\pm$~0.26   &   2.75~$\pm$~0.13   &       \\
3447    &   21.37~$\pm$~2.49  &   11.23~$\pm$~0.10  &   4.96~$\pm$~0.50   & 1.89~$\pm$~0.08 \\
\hline
\end{tabular}
\end{table}