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\begin{table}   \begin{tabular}{ c c c c c c }  Molecule & Transition & Wavelength & E$_\mathrm{upp}$/k & $n$ & $T$ \\   & & (cm) & (K) & (cm$^{-3}$) & (K) \\ \hline\hline  OH & $^2\Pi_{3/2} (J=3/2; \Delta F = 0, \pm1)$ & 18 $18$  & 0.08 $0.08$  & $10^5 - 10^7$ & 100-200 $100-200$  \\ H$_2$O & $6_{16} \longrightarrow 5_{23}$ & 1.35 $1.35$  & 640 $640$  & $10^7 - 10^9$ & 300-1000 $300-1000$  \\ H$_2$CO & $1_{10} \longrightarrow 1_{11}$ & 6.3 $6.3$  & 14 $14$  & $10^4 - 10^5$ & 20-40 $20-40$  \\ SiO & $v=1; J=2 \longrightarrow 1$ & 0.35 $0.35$  & 1774 $1774$  & $10^9 - 10^10$ & 700-1000 $700-1000$  \\ \end{tabular}   \caption{\label{tab:maser_props} Conditions for most observed mega-maser emitting species is shown. The values are primarily from \citet{stahler_palla_2004}. }   \end{table}