deletions | additions       diff --git a/sectionIntroduction_.tex b/sectionIntroduction_.tex  index 9297420..90e8830 100644  --- a/sectionIntroduction_.tex  +++ b/sectionIntroduction_.tex 
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For the current project we selected a subset of the bubbles identified above to identify those YSOs associated with infall, outflows or hot cores by observing the CS (1-0) transition near 49 GHz with the Green Bank Telescope (GBT\footnote{The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.}). CS is a probe of young star-formation. It has been detected in outflows from protostars, infall, disks and in hot cores \citep{1997A&A...317L..55D,1996A&AS..115...81B,Morata2012}. The chemistry is, naturally, complex, and it appears that CS can play several roles \citep{Beuther2002}, such as tracing outflows \citep{Wolf-Chase1998} or hot cores \citep{1997MNRAS.287..445C}. Our aim here is to use CS as a broad identifier of young star-formation and use any non-Gaussian line-shapes to infer molecular gas behavior.  After describing the CS survey and CS mapping observations ($\S$ 2) and numerical results ($\S$ 3), we analyze the Herschel-HiGAL emission toward all our sources to determine, along with our CS detections, the CS abundances ($\S$ 4.1). We also analyze three sources for {\bf with}  evidence of rapid infall ($\S$ 4.2) and three mapped regions ($\S$ 4.3). We end with a summary of the conclusions.