Similar to Fig. 10, showing the assembly history for halo 5 (top) and halo 6 (bottom). In addition to the σ_z radial profile (black/white line) and surface brightness distribution (upper right) from the Schwarzschild model, the shaded regions correspond to the variations derived from 100 Monte Carlo fits to the stellar population maps. Each panel also contains the intrinsic σ_z radial profile (red line) and surface brightness distribution (upper left) from the simulations.