Time-distance plots along Path1 (magenta), Path2 (green), and Path3 (blue) for different density profiles of the incoming wave and different CH geometries. The blue and green regions denote areas in which the density is lower than the background density (depletion), and the red and orange regions denote areas in which the density is higher than the background density (enhancement). The horizontal dark blue regions denote the CH area. All incoming waves consist of an enhancement at the wave front and a depletion area in the rear part of the wave. The CH density for all cases is ρ_CH = 0.1. (a)–(c): Interaction with a convex CH. (d)–(f): Interaction with a concave symmetric CH. (g)–(i): Interaction with a concave asymmetric CH.