Two-dimensional wall-shock test at time t = 0.5. Left: density profiles for models described in Table 4: WHS₁ (red), WHS₂ (green), and WHS_G (blue) in dots. The analytic result is the solid black line. The central panel depicts the particle distribution with density as color at t = 0.5 as obtained with GADGET-2 whereas the last panel is that of model WHS₂. We note how WHS₂ achieves lower particle disorder in the central region, and smaller density oscillations at the shock position than GADGET-2.