55 antennas on Chajnantor plains

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55 antennas on Chajnantor plains

ALMA with 55 antennas in March 2013. The Atacama Compact Array is clearly visible as the tightly-grouped set of smaller antennas. The Array Operations Site Technical Building shines in the back, with the final North American antenna behind it.

Credit: C. Padilla, NRAO/AUI/NSF

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