Upper left panel: HI on optical image. The contour levels are (1, 5, 10, 50) × 1019 cm−2. Upper right panel: HI pV diagram from Oosterloo & van Gorkom (2005). Lower left panel: best-fit model HI large-scale distribution with i = 90°. Contour levels are (3, 6, 9, 15, 30, 150) × 1019 cm−2. Lower right panel: model HI pV diagram.
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