use identical dwarf progenitors.

Orbits of merging dwarfs
========================

Fig. \[fig:disvel\] shows the evolution of relative distances and velocities of the dwarfs for simulations with different initial relative velocities. For these simulations, the trajectories of the dwarfs in the collision plane (the $XY$ plane) are displayed in Fig. \[fig:orbits\]. For our radial mergers (along the $X$ axis), the orbits are almost the same in all three cases.

In the case of radial mergers the initial conditions and the subsequent evolution are very symmetrical. As a result, the major axis of the merger remnant is aligned with the merger axis (the $X$ axis of the simulation box). By introducing some velocity in the $Y$ direction (for simulations I90VY1 and I90VY2) we introduce asymmetry in our simulations because the merger becomes prograde for Dwarf1 and retrograde for Dwarf2. This causes differences in the properties of the two dwarfs at the end of the simulation for non-radial mergers. All dwarfs initially have the velocity of 8kms$^{-1}$ towards the common center of mass. Simulations I90VY1 and I90VY2 have additional 1kms$^{-1}$ and 2kms$^{-1}$, respectively, in the perpendicular ($Y$) direction. The second approach of the dwarfs is on a close-to-radial orbit in both cases but for 