Conflicting results in measurements of the global spectrum of the hydrogen 21-cm line may indicate that there are large systematic errors. A different experimental approach to reach the redshifted signal from cosmic dawn assesses possible systematic errors together with the signal.
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Chen, X. From a small antenna to cosmic dawn. Nat Astron 6, 887–888 (2022). https://doi.org/10.1038/s41550-022-01724-w
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DOI: https://doi.org/10.1038/s41550-022-01724-w
