Color-coded cross section of the gas density distribution (in cm⁻³) illustrating the initial conditions of model M3-E3-D6-Z4.5-X4-W1 (Run 4 in Table 2). The cross section emphasizes the EDE structure, which is visible as an enhanced density in the equatorial plane. The inset provides a zoomed view of the initial geometry of the TCrB system: the WD and the spherical blast wave are located at the origin (white sphere, left), while the RG companion is positioned along the x axis at x=0.9 au (orange sphere, right). The accretion disk (blue) is centered on the WD.