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\begin{document}

\leftheader{\includegraphics[scale=0.35]{plane.eps}}
\foilhead{\flushright Exciting Astronomy at 2-6 THz}

\noindent ...a diverse, rich, and unexplored wavelength frontier...
\centering
\small


\begin{table}
\begin{tabular}{|cccc|}
\hline

\bf Species & \bf Transition & \bf THz & \bf Importance \\
\hline \hline
$[$C II$]$ & $^2$P$_{{3/2}\rightarrow{1/2}}$ & 1.9013 & Probe energetic PDR\\
$[$O I$]$ & $^3$P$_{0\rightarrow1}$ & 2.06007 & surfaces of molecular clouds,\\
$[$N II$]$ & $^3$P$_{2\rightarrow1}$ & 2.4622 & UC HII regions, AGB stars, \\
H I & n=$14\rightarrow13$ & 2.6811 &  protoplanetary disks \\
$[$O III$]$ & $^2$P$_{{3/2}\rightarrow{1/2}}$ & 3.3940 & \& molecular clouds.\\
$[$O I$]$ & $^3$P$_{1\rightarrow2}$ & 4.74580 & \\
\hline \hline

CO & J=$17\rightarrow16$ & 1.9560 & Trace energetic molecular \\
   & J=$21\rightarrow20$ & 2.4139 & gas in star-forming regions,\\
   & J=$25\rightarrow24$ & 2.8703 & PDR's, SNR's, AGB ejecta. \\
\hline \hline

o-H$_2^{18}$O & 2$_{21}\rightarrow1_{10}$ & 2.7416 & Probe enhanced H$_2$O\\
p-H$_2^{18}$O & 2$_{20}\rightarrow1_{11}$ & 2.9389 & in shocks, outflows, disks. \\

\hline \hline

HD & 0-0 R(0) & 2.67499 & Cosmological nucleosynthesis, \\
   &          &         & deuterium fractionation, \\
   &          &         & thermal history of starforming  \\
   &          &         & regions, abundance of H$_2$. \\

\hline \hline

OH & $\Pi_{3/2\rightarrow1/2}$ & 1.83 & Ground state OH; general \\
   & $\Pi_{7/2\rightarrow5/2}$ & 2.60 & H$_2$O and oxygen chemistry. \\

\hline
\end{tabular}
\end{table}


\end{document}



