Left panel: VIVA HI distribution (grey-scale; Chung et al. 2009). Grey-scale levels are (2, 4, 6, …, 40) × 1020 cm−2. Right panel: model HI distribution with i = 90°. Grey-scale levels are (4, 7, 14, 22, 30, 36, 43, 50, 58, 65, 72, 80) × 1020 cm−2. The stellar content is shown with contours. To guide the eye, the vertical lines delimit the extent of the observed HI distribution.
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