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Fig. 5


Computed ionization front around a single source in a homogeneous medium as a function of increasingly fine discretization in angles. The volume consists of 613 grid cells and is seen pole-on (i.e., from along the z axis). Deviations from the ideal spherical shape are particularly obvious close to the planes defined by the coordinate axes in the models with a low number of rays (top row). Only with a sufficient number of rays can the models reproduce the physically expected spherical shape (bottom row).

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