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Dense cores are the simplest star-forming sites and their study
provides much needed observational constraints on the
early phases of star formation.
As observational techniques have improved, interest on cores has
shifted from their global properties, to their internal structure,
and recently, to their connection with the (filamentary) cloud
environment.
I this talk, I will review our current knowledge of the
physical properties of cores from an observer's point of view,
trying to emphasize those aspects of most interest for the meeting.
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