Moment map of the H i in NGC 3109 (Ott et al. 2012). The blue contours run from 400 km s^-1 in the center to 351 km s^-1 in the west in steps of 7 km s^-1. Red contours run from 407 km s^-1 in the inner zone to 463 km s^-1 in the east. Positions of analyzed PNe (circles), H ii regions (crosses), and H ii knots (x symbols) are shown. Blue symbols indicate a negative difference and red symbols indicate a positive difference (larger than 12 km s^-1) between the observed objects and the H i velocities. We plot, in black, objects with a difference in velocity lower than 12 km s^-1, relative to H i disk.