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 V_sys  ±  0, 20, 40, and 60   km   s^-1.