Horizontally averaged density profiles as a function of time, using the modified radial coordinate x (≡ r − R₀/r). The leftmost column serves as a non-magnetic reference. The top row displays models with radial magnetic fields of 1, 10, and 20 kG, while the bottom row shows models with horizontal magnetic fields of the same strengths. The dotted black line indicates the photospheric radius (r(τ = 2/3)), and the solid black line marks the location of the iron opacity peak (T ~ 1.6e5 K).