Top: mean intensities (scaled by the emitted intensity from the stellar core, I_c) for the continuum transport, with ϵ_c = 10⁻⁶, and k_c = (10⁰, 10¹, 10²) corresponding to τ_r = (0.17, 1.7, 17.0), from left to right. Bottom: line source functions (scaled by I_c) assuming an optically thin continuum, and with ϵ_L = 10⁻⁶, and k_L = (10⁰, 10³, 10⁵) from left to right. The red line corresponds to the accurate 1D solution, the blue line is the solution along the x-axis, and the dots (mainly located in between the red and the blue line) correspond to the solution of (arbitrarily) selected grid points (only a subset of all grid points is shown to compress the images).