The warped galaxy NGC 4214. Left: velocity fields (top) and PV-diagrams (bottom) obtained from the observed cube and the model-cube. In the velocity fields, the contours range from 257 to 337 km s^-1 with steps of 16 km s^-1; the thick line shows the line of nodes; the circle to the bottom-left shows the beam. In the PV-diagrams, the contours are at −1.5 (dashed), 1.5, 3, 6, 12σ; the squares show the rotation curve projected along the line of sight. Right: tilted-ring parameters for the disk model. The open circles show the asymmetric-drift-corrected rotation curve. See Sect. 5 for details.