saving dollars with astrometry

Lang and I have showed that we could have saved the very-red-objects community quite a bit of telescope time (read: money) by measuring proper motions of faint sources and thereby obviating a bit of spectroscopy. But Rix asked us if we could have saved them not just the spectroscopy but also the infrared imaging. Lang and I spent time on this question today. Not sure that we will be able to be so cocky here.

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