Aerial view of the ALMA Operations Support Facility

Aerial view of the ALMA Operations Support Facility (OSF), located at 2900 meters altitude, on the road to Chajnantor. Three antennas are positioned beside the main OSF building. Here, the antennas delivered by the partners are tested by the ALMA observatory prior their final acceptance. © ALMA (ESO/NAOJ/NRAO), W. Garnier (ALMA).