A direct precision measurement of the intergalactic Lyman-a opacity at 2 z 4.2

Recommended citation: Faucher-Gigu\`ere, C. A., Prochaska, J. X., Lidz, A., et al. (2007). "A direct precision measurement of the intergalactic Lyman-a opacity at 2 z 4.2." Nuovo Cimento B Serie, 122, 1249-1252.
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