Comparison with 1D plane-parallel models. The figures shows the monochromatic radiative quantities, at hν = 296   eV (λ = 4.19   nm), calculated with IRIS (solid lines) and with a 1D solver (symbols), in the case of a radiative shock structure made of homogeneous plane-parallel layers. The top left panel displays the specific intensity for different polar angles θ: 0° (green, square), 45° (blue, triangle), 89° (red, filled circle), 135° (orange, diamond), 180° (cyan, asterisk), and for a set of twelve azimuthal angles ϕ(°) = (0,45,89,90,135,179,180,225,269,270,315,359). There is no legend for the ϕ values, because all the curves, for a given θ, are perfectly superposed. The top right, bottom left, and bottom right panels show respectively the mean intensity J (black, square), the components of the radiative flux vector F (black, square), and the components of the radiation pressure tensor P (P_zz:blue,square;P_xx = P_yy:red,plus). See Sect. 8.2 for more details.