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The Atacama B-Mode Search (ABS) instrument is a cryogenic ( $$\sim $$ ∼ 10 K) crossed-Dragone telescope located at an elevation of 5190 m in the Atacama Desert in Chile that observed for three seasons between February 2012 and October 2014. ABS observed the cosmic microwave background (CMB) at large angular scales ( $$40<\ell <500$$ 40 < ℓ < 500 ) to limit the B-mode polarization...
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