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Published online by Cambridge University Press: 14 August 2015
The distribution of the column density of HI over the sky shows strongly organized features of large angular extent. In particular, there is (1) a conspicuous set of arching concentric filaments extending more than 80° on either side of ℓ = 330°, and (2) a prominent extended region of low column density above ℓ ∼ +40° and centered on ℓ ∼ 130°. The changes is column density in the b-direction in this region of low NH is almost step-like at ℓ ∼ +40°.