The Atacama Pathfinder Experiment (APEX) is a twelve-meter Microwave telescope at the Llano de Chajnantor Observatory in the Atacama Desert in Chile, aimed at studying Molecular Clouds, e.g., observing their .2mm Carbon Monoxide Emission Line. It went into operation in 2004. The major instrument is its Large APEX Bolometer Camera (LABOCA), a Focal Plane Array.
European Southern Observatory (ESO)
LABOCA Extended Deep Field South Submillimetre Survey (LESS)