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Organization: An overview of the organizational structure of ALMA, the ALMA Regional Centers and the steering bodies. A detailed guide to the ALMA Regional Centers can be found in the ESO ARC Guide, NRAO ARC Guide and NAOJ ARC Guide.

Site: Describes the location of ALMA, where the antennas and the Operation Facility are located, the atmospheric conditions and transparency as a function of frequency, and some aspects of the water vapor content.

Basics: A quick description of ALMA as an interferometer and an overview of its capabilities.

Weather: A description of the weather and climate conditions at Chajnantor. A model of the atmospheric transmission as a function of frequency and precipitable water vapor content is available.