Abstract
We report the detection of a large void (~7 Mpc) between the redshifts 2.16286 and 2.20748 in the Lyα forest of Tol 1038-2712. This void is centered near a foreground QSO Tol 1037-2704, which is at a distance ~4.4 Mpc away from the void. We estimate the probability for the void to occur by chance in front of the foreground QSO to be a few times 10-3. We discuss the implications of the void being produced by excess ionization due to the foreground QSO.
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