Left panel: overlay of the velocity field of the best-fit rotating disk model (in contours spanning the range −100 km s^-1 to 100 km s^-1 in steps of 20 km s^-1) on the CO(1–0) isovelocities (color scale as shown) of NGC 1614. Right panel: overlay of the CO(1–0) intensity contours (levels as in the left-hand panel of Fig. 4) on the residual mean-velocity field (in color scale as shown) obtained after subtraction of the best-fit rotating disk model from the observations.