H I rotation curves as derived from the mean H I velocity field for the four sample galaxies to which they were fit. The panels show (a) ESO 121‐G020, (b) ESO 428‐G033, (c) ESO 215‐G?009, and (d) ESO 348‐G009. The three curves that are in all panels correspond to the approaching side (dashed line), receding side (dot‐dashed line), and both sides (solid line). The dotted curves in the ESO 428‐G033 panel show the difference that the inclination uncertainty makes for that galaxy.