\begin{table}%t1
\caption{\label{tab:observables}The main observables for ALMA in PDRs at high redshift.}
\small%\centering
\par
\begin{tabular}{llll}
\hline\hline\noalign{\smallskip}
Observable & $\lambda$~[${\rm \mu}$m] & $\rm \varphi~[mJy]$ & Min. Redshift \\
\hline
\noalign{\smallskip}
[O I] $^3$P$_1$ $\rightarrow$~$^3$P$_2$ & 63.2 & $\sim$$0.18$   &  $z>5.7$ \\ \protect
[O III] $^3$P$_1$ $\rightarrow$~$^3$P$_0$ & 51.8 & $\sim$$0.18$  &  $z>3.8$ \\ \protect
[N~II] $^3$P$_2$ $\rightarrow$~$^3$P$_1$ & 121.9 &  $\sim$$0.07$  &  $z>2.5$ \\ \protect
[O I] $^3$P$_0$ $\rightarrow$~$^3$P$_1$ & 145.5  & $\sim$$0.03$   &  $z>1.9$ \\ \protect 
[C II] $^2$P$_{3/2}$ $\rightarrow$~$^2$P$_{1/2}$  & 157.7 & $\sim$$0.7$   &  $z>1.7$ \\ \protect
[S III] $^3$P$_1$ $\rightarrow$~$^3$P$_0$ & 33.5 & $\sim$$1.5$   &  $z>11.1$ \\ \protect
[Si II] $^2$P$_{3/2}$ $\rightarrow$~$^2$P$_{1/2}$ & 34.8 & $\sim$$0.06$   &  $z>11.1$ \\  
\hline
\end{tabular}
\tablefoot{This specific example assumes a galaxy with a starburst as in NGC~1068 placed at $z=8$. We also give the minimal redshift from which the lines would be redshifted into the ALMA bands.}
\end{table}