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\caption{\label{tab:maser_props} Conditions for most observed mega-maser emitting species is shown. The values are primarily from Table 14.1 in \citet{stahler_palla_2004}. }   \end{table}  \subsection{Polarization}  \label{sub:polarization}  \begin{itemize}  \item tend to be polarized  \item arise in some cases due to coherence (similar phases needed for velocity coherence along path)  \item OH shows Zeeman splitting -- direct measurement of B_LOS  \end{itemize}