The warped galaxy NGC 1705. Left: total H I  map at ~16′′ resolution (top) and PV-diagrams at 20′′ resolution (bottom) obtained from the observed cube and the model-cube. In the total H I  map, contours are at 1.1, 2.2, 4.4, 8.8, 17.6 × 10²⁰ atoms cm^-2; the circle to the bottom-left shows the beam. In the PV-diagrams, the contours are at −1.5 (dashed), 1.5, 3, 6, 12, 24σ; 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.