Detection of the trace neutral fraction of hydrogen gas that stretches between the nearby Andromeda and Triangulum galaxies has allowed resolved spectral imaging of this elusive intergalactic medium. See Letter p.224
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Braun, R. The cosmic web in focus. Nature 497, 191–192 (2013). https://doi.org/10.1038/497191a
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DOI: https://doi.org/10.1038/497191a
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