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The 21-cm and Lyman Alpha lines are the dominant line-emission spectralfeatures at opposite ends of the spectrum of hydrogen. Each line can be used tocreate three dimensional intensity maps of large scale structure. The skybrightness at low redshift due to Lyman Alpha emission is estimated to be 0.4Jy/Steradian, which is brighter than the zodiacal light foreground.

Intensity Mapping with the 21-cm and Lyman Alpha Lines