deletions | additions       diff --git a/introduction.tex b/introduction.tex  index 68e3dde..b5425e6 100644  --- a/introduction.tex  +++ b/introduction.tex 
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\item vlbi use  \item typical inferred luminosities  \item differing properties b/w galactic & extragalactic masers  \item all mega-masers are extragalactic...  \end{itemize}