For dark ages 21 cm cosmology, foreground avoidance costs about an order of magnitude in sensitivity, making some foreground subtraction necessary for near-term arrays.
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The Impact of Foregrounds on Dark Ages Measurements with the Highly Redshifted 21 cm Line
For dark ages 21 cm cosmology, foreground avoidance costs about an order of magnitude in sensitivity, making some foreground subtraction necessary for near-term arrays.