Black and white image of the tracer, which has been inserted in the equatorial plane in order to visualize the mixing and polar spreading of the disk material of a 0.8 M_⊙ WD with Ṁ = 10^-8M_⊙/ yr. The plots differ in the stellar-rotation rate, which is given by 0.0 (a), orbit 688), 0.3 (b), orbit 251), 0.5 (c), orbit 248) and 0.7Ω_K(R_∗) (d), orbit 263). The dotted black line denotes the optical depth of τ = 2 / 3.