deletions | additions       diff --git a/h2o_megamasers.tex b/h2o_megamasers.tex  index 36f960a..aae6c91 100644  --- a/h2o_megamasers.tex  +++ b/h2o_megamasers.tex 
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The 22 GHz H$_2$O maser emission is associated with circumstellar material around late-type stars, and with molecular outflows due to young, embedded stars. These environments suggest a collisional pumping mechanism. H$_2$O mega-maser emitting regions are typically found within a few parsecs of an AGN, coinciding with regions of dense molecular gas heated to suitable temperatures for masers to occur.   \begin{itemize}  \item bennert+09, tarchi+12, tarchi+07, cernicharo+06, baan+06, baan klockner 05, baan+82, dos santos lepine 79  \end{itemize}  \subsection{Extragalactic versus Galactic Properties}  \label{sub:h2o_props}  \begin{itemize}  \item sales+15, wagner+13, mccallum+05, raluy+1998  \item circumnuclear and nuclear jet driven masers  \end{itemize}  \subsection{AGN: Disks \& SMBH masses}  \label{sub:h20_smbh_mass}  \begin{itemize}  \item greene+2013, Wardle Yusef-zadeh 12, greene+10, schulz henkel 03  \end{itemize}  \subsection{Geometric distance measurements}  \label{sub:h2o_distance}