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subarcsec resolution requires adaptive optics to correct for atmospheric blurring
blobs of water vapor
signal delayed to this antenna
differences from optical or NIR adaptive optics• water vapor fluctuations are the main problem• time scales of seconds, not milliseconds• no laser guide stars
paired antenna calibration (PACS)observe nearby calibrator at 30 GHz with 3.5-m antennas
3.5-m ant
quasar science target