Illustration of the spatial discretization scheme by example of a 2D layer containing 9 × 9 cells. The different physical conditions in each cell are represented by the different cell colors, and the black lines indicate the rays used in the radiative transfer. Insufficient ray densities where some cells are not crossed by any ray (e.g., cell I) must be avoided as this will lead to spurious results since the corresponding cells will not feel the effects of the radiation field.
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