Three ALMA antennas close together on Chajnantor

At the end of March 2010, the three antennas already positioned on Chajnantor were moved to a new location at the centre of the site, using the antenna stations that will eventually form the Atacama Compact Array. This enables the Commissioning and Science Verification team to put the antennas close together, which is essential for some of the critical tests of the antenna performance and the stability of the system.