Gas particles in the galaxy disks at three early times in the best‐model collision, with three orthogonal views at each time. The top row shows the initial disks (﹩t=-180﹩ Myr), the middle row the disks at the onset of the collision (﹩t=0.0﹩ Myr), and the bottom row the disks at a time just after the closest approach of galaxy centers (﹩t=40.0﹩ Myr). The labels "A" and "B" in this and the following figures denote the model galaxies representing NGC 7714 and NGC 7715, respectively. For galaxy A every third gas particle is plotted; for galaxy B every particle is plotted. Coordinates are given in dimensionless code units, which can be scaled as described in the text. (Note that we assume that the observer is located at the appropriate distance along the negative z‐axis.)