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We present GLIMPSE results on the structure of the Milky Way both in the old stellar population and the star forming regions. We confirm the claim of Drimmell & Spergel (2001) that the Sagittarius-Carina spiral arm of the Galaxy, while clearly a major structure in star formation, is not associated with a detectable overdensity of red giants that trace the stellar mass of the Galaxy. We calculate the amplitude of both the stellar and star forming arms of the galaxy and discuss the implications for studies of global star formation.
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