Surface density distributions in the face-on view of the stellar components of the MW-like galaxies in the controlled simulations. The coordinate system is that of the simulation box, with the galaxy disk always in the XY plane. In all images, the galaxy is rotating counter-clockwise. The three upper panels show three stages of the evolution for the MW interacting with a satellite and the three lower panels three stages of the simulation of the MW with an off-center disk. The initial configurations are presented in the left-column plots. The surface density, Σ, is normalized to the central maximum value in each case and the contours are equally spaced in logΣ.