Face-on (top) and (bottom) edge-on gas contours for model A with R_g = 2R_d merging with a 20% mass satellite on a radial, co-planar orbit depicted in Fig. 4, initially (far left) and after 1 (middle left), 2 Gyr (middel right) and 3 Gyr (far right). The plane of the disk in determined by the angular momentum of the inner 50% of the initial stellar particles, so the rotation in the gas can be in a different plane.