Left panel: R-band optical image of UGC 11919 and H I total intensity with overplotted contours of the bisymmetric model (pink in online version, grey in printed version) H I total intensity: 5.4, 20, 35 and 80 × 1019 atoms cm-2. Middle panel: the comparison of observed and bisymmetric model intensity maps with H I total intensity contours: 5.4, 20, 35 and 80 × 1019 atoms cm-2. Right: first-moment map with overplotted observed (blue in online edition, black in printed version) and bisymmetric model (pink in online version, grey in printed version) contours Vsys ± 0, 20, 40, and 60 km s-1.
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