Evolution of the unstable (Q_eff(R = R^∗) = 0.8) model C in the presence of counterrotation. In this composite figure, the top frames illustrate the evolution of the host component, the middle frames show the evolution of the secondary counterrotating component, and the bottom frames display the appearance of the disk obtained by superposition of the two components. The left part of the figure shows an initial snapshot of the system, whereas the right part illustrates the face-on morphology of the system at time t = 0.7 Gyr. The central part of the figure illustrates the time-dependent evolution of the vertical disk structure (edge-on view) in the time interval 100−600 Myr, with steps of 100 Myr. Face-on images have 20 kpc spatial size, vertical size of edge-on views is equal to 4 kpc.