One-dimensional radial profiles of the 5 M_⊙ model st35gm04n045 showing radial velocity v_radial, radial Mach number Ma_radial = v_radial/c_sound, dynamical pressure due to radial velocity over gas pressure $\rho v_{\text{radial }}^2/P$, logarithm of temperature log(T), logarithm of gas density log(ρ), logarithm of pressure log(P), logarithm of Rosseland opacity per mass unit log(κ[cm²g⁻¹]), logarithm of Rosseland opacity per volume log(κ[cm⁻¹]), and logarithm of Rosseland optical depth along the ray log(τ_Ross). The colors (red, orange, green) indicate the three time steps selected in Figs. 2 to 4, about 8·10⁶ s (92 d) apart. The plus signs mark the position of optical depth unity (τ_Ross = 1), integrated along the ray.