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The COSMOS survey is the largest contiguous imaging project ever undertaken with the Hubble Space Telescope, using ACS/WFC to image a 2 square degree low-background equatorial field in 600 orbits with the F814W (I) filter. The survey is providing over 2 million objects with a 10σ detection limit AB(I)<27, with a sky coverage of 10 billion ACS pixels at a scale of 50 milliarcseconds/pixel. The principal...