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What you see in the photo above is the dish of one of the Atacama Large Millimeter/submillimeter Array (ALMA) antennas in the Atacama desert of northern Chile. Two engineers from the ALMA Operations Support Facility inspect the dish from the inside sitting and standing on the reflector surface. Every antenna is calibrated and tested at the Operations Support Facility, located at an altitude of 2900m, before being moved to the 5100m-high Array Operations Site.
Image: M. Alexander/ESO