deletions | additions       diff --git a/section_Introduction_Massive_stars_strongly__.tex b/section_Introduction_Massive_stars_strongly__.tex  index d4d0381..92ae420 100644  --- a/section_Introduction_Massive_stars_strongly__.tex  +++ b/section_Introduction_Massive_stars_strongly__.tex 
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The current project aimed to identify the youngest YSOs by observing the CS (1-0) transition near 49 GHz with the Green Bank Telescope (GBT). CS is a probe of young star-formation. It has been detected in outflows from protostars, infall and in hot cores (citations?). The chemistry is, naturally, complex, and it appears that CS can play several roles. 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 (sec 2) and numerical results (sec 3), we analyze the Herschel-HiGAL emission toward all our sources to determine, along with our CS detections, the CS abundances (sec 4.1). We also analyze three sources for evidence of rapid infall (sec 4.2) and three mapped regions. regions (sec 4.3).  We end with a summary of the conclusions.