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KENNEDY SPACE CENTER, FLA. -- The inside of Atlantis' payload bay can be seen from inside the payload changeout room. The changeout room is the enclosed, environmentally controlled portion of the rotating service structure that supports cargo delivery to the pad and subsequent vertical installation into the orbiter payload bay. At the top of the photo is the orbital docking system. At bottom is the integrated cargo carrier - lite, holding three elements: a nitrogen tank assembly that is part of the external active thermal control system on the International Space Station, the European techn…