\begin{table}%t2
\caption{\label{tab:redranges}Sets of emission lines required to have $S/N>4$ in various redshift
ranges associated with the various diagnostics used in this study.}
%\centerline
 {\small \begin{tabular}{lrrrrrr}
\hline \hline
Redshift & {[}O\noun{ii}] & H$\beta$ & {[}O\noun{iii}] & H$\alpha$ & {[}N\noun{ii}] & {[}S\noun{ii}]\\
\hline
$0.0<z<0.2$ &  &  &  & $\checkmark$ & $\checkmark$ & $\checkmark$\\
$0.2<z<0.4$ &  & $\checkmark$ & $\checkmark$ & $\checkmark$ & $\checkmark^{\star}$ & $\checkmark^{\star}$\\
$0.4<z<0.5$ &  & $\checkmark$ & $\checkmark$ &  &  & \\
$0.5<z<0.9$ & $\checkmark$ & $\checkmark$ & $\checkmark$ &  &  & \\
\hline
\end{tabular}}
\medskip
 $^{\star}$ For the red diagnostic the [N{\sc ii}] $\lambda$6584 and [S{\sc ii}] $\lambda\lambda$6717+6731 emission lines may not be used at the same time. 
\end{table}