Alyssa Goodman added missing citations  almost 11 years ago

Commit id: 52678534cdf1c0cc92929b924083edd2f5e43503

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\section{Introduction}  Determining the structure of the Milky Way, from our vantage point within, is a perpetual challenge for astronomers. We know the Galaxy has spiral arms, but it remains unclear exactly how many, cf. \citep{Vallee2008a}. Recent observations of maser proper motions give unprecedented accuracy in determining the three-dimensional position of the Galaxy's center and rotation speed \citep{Reid2009,Brunthaler2011}. But, to date, we still do not have a definitive picture of the Milky Way's three dimensional structure.  Fake reference \citep{http://adsabs.harvard.edu/abs/2012ApJ...761..189H} \citep{2012ApJ...761..189H}  The analysis offered in this paper suggests that some Infrared Dark Clouds\footnote {The term ``Infrared Dark Cloud" or ``IRDC" typically refers to any cloud which is opaque in the mid-infrared.}--in particular very long, very dark, clouds--appear to delineate the major features of our Galaxy as would be seen from outside of it. In particular, we study a $>3^{\circ}$-long cloud associated with the IRDC called ``Nessie" \citep{Jackson2010}, and we show that it appears to lie parallel to, and no more than just few pc from, the true Galactic Plane.