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Galaxy formation

The cosmic web in focus

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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Figure 1: Galactic-mass assembly.

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Correspondence to Robert Braun.

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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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